: if (), unless ( ), : provided (that) = providing (that) ; on condition (that) , ; in case .
: , .
1. , , , , . (Present Past Simple), , . , . :
If my friend is busy, I don`t ask to help me. , .
If my friend was busy, I didn`t ask to help me. , .
If my friend is busy, I will not ask to help me. , .
, . :
If I have a possibility, I will go to England to improve my English. , .
I will give my friend the textbook on condition (that) he returns it next week. , , .
You won`t finish the work in time unless you work hard. , .
2. (Past Simple), (Future Simple in the Past), to be were. . :
If the weather were fine tomorrow, we would go to the country. , .
3. (Past Perfect), should would. . :
If the instructions had been received ten days ago, the goods would have been delivered in time. , .
but for + . but for . :
But for my friend I would not have got these dictionaries. , .
1. should c to. , . :
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If need should arise, they will communicate withus again. (: ) , .
2. . :
If he should come, show him your drawings. , .
3. if . :
Should he come, ask him to wait for me. , .
Were he here, he would help us. , .
Had he known it, he would never have done it. , .
