It should be done according to some kind of reference (theory, the relationship between interests and so on).

because of this, there should be a subject behind it. This can't be regarded as an independent word, which refers to what is what.

for example, the student was expelled from school because he dozed off in class. Have a causal relationship.

should be specifically explained:

is a Chinese vocabulary, pronounced yīng gāi, which is used for suggestions, so it is inevitable or necessary; It means to speculate that the speaker's cognition of the phenomenon is uncertain or he is not confident in what he says.

① indicates that it is necessary or necessary in reason and morality.

you should comfort her, not scold her.

you shouldn't try to shirk your responsibilities.

this is a good time to ask questions, and it is also my decline, so I should. -Yuan Qin Jianfu's The Third Fold of Zhao Li Rang Fat

I'm here for nothing else, because my uncle has no husband and should be inherited by my nephew, so I chose an auspicious day to send my children to my door. -Qing Li Yu's

Go and call him. The field he planted is also on the east side of the bridge, so there should be some points. -Hong Shen's

(2) said that the speaker's cognition of the phenomenon is uncertain, or he is not confident in what he said.

You should, for example:

You should choose the first answer to this question. (expressing a guess about the situation, or expressing the opposite fact. )

Related quotes

A person's value should be judged by what he has contributed, not by what he has achieved. -Einstein

We should not waste our lives, and we should be able to say, "I have done what I can." -Madame Curie

Only by doing what you should do, what you can do and what you like can you do best. -Zhou Haizhong

Life should be like a candle, which is always bright from the top to the end. -Xiao Chunv

We can't all serve the motherland in the same way. Everyone should do his best according to his aptitude. -Goethe

Science is by no means a selfish pleasure. Those who are fortunate enough to devote themselves to scientific research should first serve mankind with their knowledge. -Marx

People should control their habits, but never let them control others. A person can't get rid of his bad habits, which is simply worthless. -ostrovsky