1. Know what a sentence is. A sentence consists of words or phrases, which can express a complete meaning. Its form is "who (what, where)" plus "what (what, how)". For example, Xiao Ming studies knowledge seriously in the bright classroom. Understanding sentences is very helpful for us to modify sick sentences and transform sentences later.

2. Distinguish four sentence patterns: declarative sentence, interrogative sentence, imperative sentence and exclamatory sentence. Declarative sentence: a sentence that can tell others one thing, with a period at the end. I visited the Great Wall. Interrogative sentence: a sentence that asks questions to others, with a question mark at the end. Why are the days gone forever? Imperative sentence: a sentence that asks others to do something, usually with a period at the end and sometimes with an exclamation point. The oil depot is important, please don't smoke! Exclamation sentence: a sentence with strong feelings of happiness, surprise, disgust, etc., with an exclamation point at the end. How happy our life is!

(2) Changing the preparation point of a sentence The same meaning can be expressed in many forms.

Different expressions have different language effects. Changing sentence patterns means changing one sentence into another with the same meaning. Common ones are:

1, interchange of Ba sentence, Bei sentence and declarative sentence;

2. The exchange of affirmative sentences and double negatives;

3. Interchange of declarative sentences, rhetorical questions and exclamatory sentences;

4. Direct speech and transitive sentence interchange.

5. Expansion and contraction.