The lion is regarded as the king of the jungle, with strength and courage.

B is an example.

C is a sign and a signature.

D is the mark, the score.

As can be used not only as a conjunction to guide various adverbial clauses, but also as a relative pronoun to guide attributive clauses, and its usage is diverse and complicated. Now, for the convenience of the students, let me summarize the as clause.

1. Adverbial clause guiding time,

Such as "when", its characteristics are:

1) is used to indicate that two actions of the same person are carried out alternately, meaning "while", such as:

The girl sang and danced on the stage. The child is singing on the stage.

He looked back from time to time as he walked forward. He looked back from time to time as he walked.

2) Two simultaneous actions or behaviors, translated as "with ...". For example:

As time went on, she became more and more worried. As time went on, she became more and more worried.

As children grow older, they become more and more interested in the things around them. As they get older, they become more and more interested in the things around them.

3) It means that two short-lived behaviors or events occur almost simultaneously. For example:

I thought of it as soon as you spoke.

Just as the flying insect hit her in the face, she let out a cry.

4) When a noun is followed by a certain age group, use as. For example:

When he was young, he took an active part in sports. When he was young, he was very active in sports.

Pay attention to the difference between when and while:

1)when is the solution of "when", which can refer to a very short (a little) time, or it can refer to a period of time when the action of a clause can occur at the same time or before the action of the main sentence. For example:

He could speak seven foreign languages when he was in college. He could speak several foreign languages when he was in college.

When the clock struck twenty, all the lights in the street went out. When the clock struck 12, all the lights in the street went out.

2) 2) The verb in the while clause is a progressive verb, indicating a long period of time or a process, and the main sentence action is carried out at the same time or occurs during the action of the clause. For example:

Work at work. Play while playing. Work while you work, and play while you play.

2. Adverbial clause leading to the cause

"Since" and "because" are equivalent to "since" and are often used to express reasons or reasons that people already know or are obvious. For example:

You can stay at home because you are not feeling well. Since you are in poor health, you'd better stay at home.

Pay attention to the difference between because and since: because it means the strongest tone, it means the direct reason; Self is often used in written language to express the reason that the other party knows or can know with a little analysis, and sometimes it can be translated as "self"; However, as is usually placed at the beginning of a sentence to guide the adverbial clause of the cause, with a weak tone and a high degree of colloquialism. For example:

He will succeed because he is serious. He is sure to succeed, because he is serious.

Since you are so sure, he will believe you.

It rained and the air became cool. The air is fresher because of the rain.

3. Adverbial clause of guiding mode

In the "like way" and "existing way". For example:

You must do everything like me. You must do as I do.

She lay in bed as the doctor told her. She stayed in bed according to the doctor's instructions.

Leave it as it is. Just leave it as it is.

Pay attention to the difference with if. As if/if introduces an adverbial clause, which means "as if, as if". If the situation expressed in the clause is true or probable, the direct mood is usually used in the clause; If the if clause describes an unrealistic situation or is purely hypothetical, then the clause should use the subjunctive mood. In addition, if-guided clauses are sometimes omitted, generally omitting the same subject and verb be as the main clause. For example, he always talks to me as if he were my brother. He always talks to me like a brother. The boy ran around as if looking for something left on the playground. The child ran around as if looking for something left on the playground. He acted like a fool. He acts like a fool.

4. Guide comparative adverbial clauses.

In as ... like ... or not like this/that ... like ... the former as an adverb and the latter as a conjunction, and the comparative adverbial clauses it leads to are mostly omitted. For example:

They help the elderly as much as possible. They help the old man as often as possible.

T speak English as well as he does. I don't speak English as well as he does.

Several common sentence patterns about as ... as:

1) as ... as much as possible (equal to as ... as someone. Can/may)

Please answer my question as soon as possible. Please answer my question as soon as possible.

2) As ... As usual/as before

She looks as beautiful as before. She looks as beautiful as before.

In addition, some as ... as structures are often used as idioms:

Busy as a bee

As simple as ABC

As deep as a well

As light as a feather as a feather

Soft as butter.

Being as rich as a Jew is as rich as a Jew.

Leading adverbial clause

As-guided concession clauses must be inverted in the form of: 1) antecedent predicate (the article should be omitted when singular countable nouns are used as predicates) 2) antecedent adverbial 3) antecedent verb prototype. For example:

Child as he is, he knows what to do. Child as he is, he knows what to do.

Despite his best efforts, he failed in the exam. Although he worked hard, he still failed the exam.

Much as I like it, I can't help the laptop. Much as I like this laptop, I can't afford it.

Pay attention to the difference between Through and which: which and which can also guide adverbial clauses, meaning "although, although", but as indicates a strong tone, and the guiding adverbial clauses adopt inverted word order; Although it is a little formal, and the clauses it leads can be placed at the beginning of the sentence or in the sentence. But in the main sentence, you can use yet, and the clause it leads to cannot be inverted. The adverbial clause guided by though is the most commonly used, and the clause it guides can be inverted like the as clause or used in normal word order. In addition, when the subject of the main clause and the subject of the clause are the same, and the predicate verb of the clause has be, the clauses guided by though and when can be omitted. For example:

Although he is very old, he still jogs every day. Although he is very old, he still jogs every day.

Although this room is not very big, it has good light and is comfortable to live in. Although the room is small, it is well lit and comfortable to live in.

Although the author was born in Chicago, he is best known for his stories about new york City. Although this writer was born in Chicago, he is famous for writing stories about new york.

6. Used as relative pronouns to guide attributive clauses.

When the relative pronoun as guides the attributive clause, it can guide both non-restrictive attributive clauses and restrictive attributive clauses. When as leads restrictive attributive clauses, antecedents are generally modified by as, such as. For example:

So the good film you described is worth seeing. Such a good film as you described is well worth seeing.

I am reading the book that he bought yesterday. I am reading the book that he bought yesterday.

When as leads a non-restrictive attributive clause, the antecedent is usually a sentence or part of a sentence. For example:

She is late, as is often the case. She is late, as is often the case. (The antecedent is the whole main clause)

It is very foolish to turn a blind eye to the facts like many of you. It is very foolish to turn a blind eye to the facts-so are many of you. (The antecedent is an infinitive phrase)

Pay attention to the difference between which-guided non-restrictive attributive clauses and modifying a sentence: 1)as-guided attributive clauses are very flexible and can be placed before or after the main sentence, or inserted in the middle of the main sentence, while which-guided attributive clauses can only be placed after the main sentence. For example:

Now we all know that heavy objects and light objects fall at the same speed unless the air stops them.

As we all know now, if there is no air resistance, heavy objects and light objects will fall at the same speed.

Now we all know that heavy objects and light objects fall at the same speed, and endless air makes them retreat. As we all know, light objects and heavy objects fall at the same speed unless there is air obstruction.

Bamboo is hollow, which makes them light. Bamboo is hollow, which makes it light

2) When referring to the modified sentence, as still retains its meaning as a conjunction, meaning "just like, like, like …"; It just refers to the meaning of the sentence it modifies. For example:

As we expected, he passed the exam successfully. As we expected, he passed the exam.

He was late this morning, which surprised us very much. He was late this morning, which surprised us very much.

3)as is often used as an object in clauses, and only as a subject in passive attributive clauses such as as is known, As is reported, As is said and As is announced; Which is often used as the subject in clauses, but which can also be used as the object when there is an object complement in non-restrictive attributive clauses. For example:

She made rapid progress, which made her parents happy. She made rapid progress, which made her parents happy.

Everyone can see that he has been greatly hurt. As we all know, he suffered great injustice.

Betty told a lie, which was very strange to her parents. Betty lied, which made her parents feel very strange.