Распространенные ошибки

Choose the correct option

I'll see you when I come back

I'll see you when I shall come back.

If the verb in the main clause is in the future, the verb in the time clause must be in the present tense

Sir, to go home to get my book?

Sir, may I go home to get my book?

The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb

Last Sunday Alisa told me that she might come.

Last Sunday Alisa told me that she may come.

May changes to might in subordinate clauses, when the verb in the main clause is in the past simple tense.

The conjunction that is never preceded by a comma.

You ought to come yesterday.

You ought to have come yesterday.

Also possible:

You should have come yesterday.

Don't use must and ought to as past tenses. To express a past duty (which wasn't done) use the perfect infinitive without to after ought to or should, or expressions such as had to, was obliged to.

In indirect speech use must and ought to as past tenses: He said he must do it.

If he asks me, I will stay.

If he'll ask me, I will stay.

Use the present tense in a future conditional in the if clause and the future tense in the main clause

But the future tense may be used in an if clause expressing a request: If you will/'ll give me some money I will/'ll buy you a drink.

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