Use the simple present tense in future-time clauses (when the action will take place sometime in the future). (Never use will or going to in future-time clauses.) Time clauses are introduced by such words as: when, while, after, before, as soon as etc.
a)      Future-time clauses:
                                present
As soon as they get the degrees, they are going home.
       Future-time  clause
          present
When I see him, I will give him your message.
Future-time  clauses
Other tenses may also be used in time clauses, but the present tense must be used in future-time clauses when the main clause is in the future.
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ERROR EXAMPLES
A.   WRONG :  Whenever you will be in town, call me.
RIGHT : Whenever you are in town, call me.  
B. WRONG : As soon as I will get all the vaccinations I will need, I will be leaving for Southeast Asia.  
RIGHT : As soon as I get all the vaccinations I will need, I will be leaving for Southeast Asia.  
C. WRONG : After Dave is going to break the track record, many universities will  offer him scholarship.
RIGHT : After Dave breaks the track record, many universities will offer him scholarships.
RIGHT : Whenever you are in town, call me.
B. WRONG : As soon as I will get all the vaccinations I will need, I will be leaving for Southeast Asia.
RIGHT : As soon as I get all the vaccinations I will need, I will be leaving for Southeast Asia.
C. WRONG : After Dave is going to break the track record, many universities will
RIGHT : After Dave breaks the track record, many universities will offer him scholarships.
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EXERCISE 2 : Put  “C” if the sentence is correct. Put “X” if there is a mistake in the time clause. 
_____1. You should visit that part of the country when it will be spring.
_____2. It will get cold in the desert when winter will come.
_____3. As soon as you learn to swim, I will take you to our cabin at the lake.
_____4. When the children are going to visit their grandmother, Henry  and I will be going  to Europe.
_____5. When Bruce visits him tomorrow, his doctor will probably tell him to increase his   medication.
_____6. Will you buy me a wool jacket when you will be in Scotland?
_____7. The actress who plays this role will receive an award when the critics will see her  performance. 
_____8. When I have time I will try to run two miles.  
_____9. When the fire engines go down the street, all the dogs in the neighborhood  howl
____10. As soon as John will get a good job, she is going to buy a condominium. 
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