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Originally Posted by Lenka  I don't understand when present perfect tense can and can not be used in time clauses.
I've done some exercise from "English Grammar in Use" (R. Murphy) and I don't understand why present tense sometimes is and on the other hand, sometimes isn't used.
1) It's going to start raining. Let's go home before that. => Let's go home before it starts raining. ( NOT!!! ...has started raining. -why?)
2) Would you like a cup of tea before you go / leave? (NOT ...you've left? - why?) |
Lenka, we tend to use present simple for things that have become "scheduled".