Answer:
1. If I <u>go</u> out tonight, I <u>will go</u> to the cinema.
2. If you <u>get</u> back late, I <u>will be</u> angry.
3. If we <u>don't see</u> each other tomorrow, we shall see each other next week.
4. If he <u>comes</u>, I <u>would be</u> surprised.
5. If we <u>wait </u>here, we <u>will be</u> late.
6. If we <u>go</u> on holiday this summer, we <u>will go</u> to Spain.
7. If the weather <u>do not improve</u>, we <u>will not</u> have a picnic.
8. If we <u>leave</u> now, we <u>shall be</u> home in time to see the football match.
9. If Mary <u>don't like</u> the present, John <u>will buy</u> something different.
10. My daughter <u>will finish</u> university by 2017 if she <u>starts</u> this year.
11. If his friends <u>come</u>, he <u>will be</u> extremely happy.
12. If I <u>save</u> enough money this year, I <u>shall go</u> to New York.
13. You <u>will stay</u> at my place if you <u>come</u> to my city.
14. His parents <u>will be</u> upset if he <u>doesn't pass</u> the exam.
15. If I <u>pay</u> today, you will owe me some money then.
Explanation:
I have been to complete the sentences.
We see the use of the words in bracket. The use of "will" and shall" are used here. "Will" is used in affirmative sentences and also in negative sentences. It is also used when making requests. "Shall" is used is used when describing obligations.
We see the use of the conditional word "if" used in each sentence. It means that if this happens, that will take place/happen.