關於 If 用法？

If the phrase starts with IF ,use future tense.
the phrase before or after IF phrase, use simple tense.
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IF clause - Simple Present tense
MAIN clause - will-future tense
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EXAMPLE
If I study, I will pass the exams.
(IF clause-present tense) (MAIN clause-future tense)

If you see John tonight, tell him to e-mail me.
(IF clause-present tense) (MAIN clause-future tense)

I will pass the exams if I study.
(MAIN clause-future tense) (IF clause-present tense)
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1. If they get the prize, they _WILL BE_ (be) very happy.
(IF clause-present tense) (MAIN clause- future tense)

2. I __WILL TRAVEL___ (travel) around the world if I win a million dollars.
3. They will not go hiking if it __RAINS____ (rain).
4. If Charlie ___COMES______ (come), he will tell him the truth.
5. If there is a typhoon, we ____WILL STAY_____ (stay) at home.
6. Your mother _WILL BE__ (be) angry with you if you __DO NOT STUDY__ (not study) hard.
7. Polly __WILL LOOK_ (look) after her brother if she _HAS_ (have) time.

MORE INFORMATION ON http://www.englisch-hilfen.de/en/grammar/if_type1.htm

1 are 2 travel 3rain 4 come 5are staying 6is 7look