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Conditional sentencesIf the weather clears, we'll go for a walk.
If she finishes work early, she will go home. (if + simple present + will) If she has finished work by 4 o'clock, she will go home. (if + present perfect + will)
If he doesn't hurry, the plane will have left by the time he gets to the airport.
If the weather clears, we'll go for a walk. (Not "If the weather will clear")
1 If it (be) fine tomorrow, we (go) for a picnic. see the answer 2 If I (have) time tonight, I (finish) the novel I'm reading. see the answer 3 If it (rain) next weekend, we (not able to) plant the vegetables. see the answer 4 If he (be leaving) at 6 o'clock, I (ask) him to give me a lift. see the answer 5 If she (have drive) all that way since this morning she (be) tired and hungry. see the answer 6 If they (have/be working) all afternoon, they (probably need) a cup of tea. see the answer 7 If I (can't/finish) the job this weekend, I (try) to get it done during the week. see the answer 8 If John (be picked) for the team, he (be boasting) about it for weeks! see the answer 9 If you (have/forget) to phone, they (will have/go) without you. see the answer 10 If we (stay) in this flat till May, we (will have/be living) here for twenty years. see the answer 'If it's fine tomorrow, we may go for a swim.'
If the weather clears, we'll go for a walk. (certain, or nearly certain) If we do not feel 'certain' enough to use will, we can use another modal to say what is possible, necessary or desirable, for example: If it's fine tomorrow, we may go for a swim. (it's possible) If it's fine tomorrow, we must go for a swim. (it's necessary or desirable to do this)
1 If you (be) still ill tomorrow, you stay at home. see the answer 2 If you (finish) work early, you come for a drink with us. see the answer 3 If she (have) too much to do, she ask someone to help her. see the answer 4 If he (not be coming) tonight, he come next week. see the answer 5 If he (have/only just arrive), he not have heard the news. see the answer 6 If they (have be/waiting) longer than an hour, they be getting impatient. see the answer 7 If we (can't/go) next week, we manage to go the week after. see the answer
If I should see him, I'll ask him to ring you. (= If I see him, I'll ask him to ring you.)
1 If you see him, please give him this message. see the answer 2 If she asks you, please don't tell her anything. see the answer 3 If he phones, please say I'm out. see the answer 4 If the temperature fall, turn up the heating. see the answer 5 If you receive a letter, let me know. see the answer 6 If you go out, get me a paper see the answer 'Fail to pay and ...'
1 We follow the imperative with and in place of an ifclause in the affirmative: If you fail to pay, they'll cut off the electricity. Fail to pay and they'll cut off the electricity. 2 We follow the imperative with or in place of an ifclause in the negative: If you don't stop borrowing money, you'll be in trouble. Stop borrowing money, or you'll be in trouble.
1 If you ask me nicely, I'll mend it for you. see the answer 2 If you crash my car, I'll never forgive you. see the answer 3 If you work late tonight, I'll pay you well. see the answer 4 If you don't hurry, you'll be late. see the answer 5 If you don't take a taxi, you'll miss your train. see the answer 6 If you don't stop shouting, I'll slap you. see the answer
