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The present tense of subject and subordinate means that in time adverbial clauses and conditional adverbial clauses, if the main clause is in simple future tense, the subordinate clause uses simple present tense instead of simple future tense.

The following four situations are common:

1. The main clause of the conditional adverbial clause is the future tense, so the clause is often in the present tense

For example ： When I grow up, I'll be a nurse and look after patients

I will be a nurse and look after patients

2. If the main clause is an imperative sentence, Then the clause usually uses the present tense.

For example: Don't laugh at me when I make a mistake.

Don't laugh at me when I make a mistake.

3. If the main clause is in the present tense containing a modal verb, the present continuous tense should be used in the subordinate clause as needed

For example: You should be quiet when you are in the reading room

Keep quiet in the reading room

4. If the conditional adverbial clause of if encounters the transformation of indirect and direct, the imperative sentence should be used not to....

For example; She said not to close the window

Differentiate the main clause and the subordinate clause: Simply put, the main clause is the center of the problem. The central meaning of a sentence is reflected in the main clause. Therefore, judging the master-slave relationship must start from the meaning.

Or according to the introductory word, the introductory word is followed by the clause. Attributive clauses mainly modify nouns and pronouns. The main relative words are; who whom whose which that when where why

The predicative clause is placed after the linking verb as a predicate.

Adverbial clauses of time when, whenever, while, as, before, after, since, till, once, as soon as, etc.

Adverbial clauses of place where, wherever

Adverbial clause of reason because, since, as, for, now that, etc.

Adverbial clause of purpose in order that, so that, that, etc.

Adverbial clause of result Clause so...that, so that, such...that, that, etc.

Conditional adverbial clause if, unless, as(so)long as, etc.

Concessive adverbial clause though , although, even if, even though, however, whatever, as, etc.

Comparative adverbial clause as...as, so...as, than, etc.

Manner adverbial clause as , as if, as though, etc.