13 If you took some exercise, you wouldn't feel unhealthy
14 If we protect the environment, our life won't be badly affected
15 If he doesn't change his way of living, he will meet a lot of troubles
16 If I were free today, I could go on a picnic
17 If you don't keep your feet dry, you will get a cold
18 They have not corresponded each other since last year
19 Unless you water these plants, they will die
20 near school, she would go to school late
21 she had enough money, she could buy the computer
22 are going to be invited to her birthday party next week
23 me to buy this interesting book
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