The main linking words for
conditional clauses are if and unless, but even if, as/so
long as, supposing, whether... or, however (+ adjective/determiner), whoever,
wherever, whenever, etc., providing/provided (that), no
matter who/how/when etc. can also be used:
• If they're short of
money, they don't eat out. (zero conditional)
• You'll have a tussle with
the management if you go ahead with that plan.
(first conditional, possible
future action) Note that if you should go ahead... or should you
go ahead... are more formal.
• If they had a bigger
garden, they could grow their own vegetables.
(second conditional, hypothetical
but possible)
Similarly:
• If you were to join the committee, we'd be very pleased.
Note that Were you to
join... is more formal.
• If you hadn't been late,
you would have understood the lecture.
(third conditional, referring to
a past situation)
There are also mixed
conditionals:
• If you hadn't been late,
you'd know what we're talking about now.
and a more formal version of
the third conditional:
• Had you arrived on time,
you would have understood the lecture.
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