Three situations: future tense of the main clause and present tense of the subordinate clause

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

The following six situations are common:

1. If the main clause is in the future tense or expresses future meaning, then the conditional and time adverbial clauses are mostly in the present tense

For example: When I grow up, I will be a nurse and look after patients/ I want to be a nurse and look after patients.

I want to be a nurse and look after patients when I grow up. .

2. If the main clause is an imperative sentence, the subordinate clause is usually in the present tense.

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

Don't laugh at me when I make mistakes.

3. If the main clause is in the present tense containing a modal verb, use the present tense in the subordinate clause as needed

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

Remain quiet while in the reading room.

4. If the conditional adverbial clause of if encounters the transformation of indirect and direct, the imperative sentence should use notto....

For example; She said not to close the window

Common conjunctions of time adverbial clauses include: as soon as, when, while, as, until, etc.

5. The subject and the subject are speaking now when they contain time adverbial clauses and conditional adverbial clauses. In a subject-subordinate compound sentence, if the tense of the main clause is the future simple tense, then the subordinate clause must use the present tense.

For example: I will tell him about it when he comes.

If it is fine tomorrow, we will go outing.

6. If in the main clause The tense is past future tense, so the clause must use past tense. For example:

He said that he would have another try if he had the chance.

I knew he could help me if he was free the next day.

The main signs are: if, unless, until, when, as soon as, etc.