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Be + to-infinitive is used to express:
In formal English, the subject and the auxiliary can be inverted in the if-clause with if omitted:
In the first conditional, happen to and should can be used in the if-clause to express that something is possible but not very likely:
If you happen to see Kate, say hi from me. If you should see Kate, say hi from me.
We can use modals other than would in the main clause of a sentence in the second conditional:
We can use modals other than would in the main clause of a sentence in the third conditional:
If I had had the right tools, I could have fixed my bike. (ability)If the weather had been worse, they might not have reached the top. (possibility)
Can and may are used to give permission. May is more formal and less common in everyday contexts:
You can borrow my car if you want. Children may use the pool with adult supervision.
For timeline diagrams, quotes and exercises, check out our e-book The Grammaring Guide to English Grammar