A future tense is not used in a time clause. The meaning of the clause is future, but the simple present tense is used.
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Bob will come soon. When Bob comes, we will see him.
Linda will leave soon. Before she leaves, she is going to finish her work.
I will get home at 5:30. After I get home, I will eat dinner.
The taxi will arrive in less than five minutes. As soon as the taxi arrives, we will be able to leave for the airport.
They are going to come soon. I will wait here until they come.
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Occasionally, the present perfect is used in a time clause. The present perfect stresses the completion of the act in the time clause before the other act occurs in the future.
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I will go to bed after I finish my work.
I will go to bed after I have finished my work.
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Grammar Exercises
Exercise 1. Use the words in brackets to write sentences. All the sentences are future. Use the Present Continuous or the Present Simple.
1. (I / not / go out / tonight) I’m not going out tonight.________________________________
2. (the concert / start / at 8.15) The concert starts at 8.15.______________________________
3. (I / meet / my friends this evening) ______________________________________________
4. (Tom / not come / to the party on Thursday) _______________________________________
5. (The English course / finish / on 10 May) _________________________________________
6. (my sister / get married next December) __________________________________________
7. (I / not go / to London tomorrow) _______________________________________________
8. (my train / leave / at 8.45) _____________________________________________________
9. (what time / the train / leave)__________________________________________________?
10. (what time / you / leave / tomorrow?) ___________________________________________?
11. (when / they / get marries?) ___________________________________________________?
12. (when / the next English course / begin?) ________________________________________?
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