Complete the sentences with the correct form of the verb in brackets.

1) Ice turns to water if you heat it. 2) If he reads in bad light, he will ruin his eyes. 3) If she needs a dictionary, she can borrow mine. 4) If today is Friday, tomorrow will be Saturday. 5) If he is late, we will go without him. 6) Unless you are more careful, you will have problems with this work. 7) If I tell you a secret, promise not to tell it to anyone else?