Conditions
We
sometimes use whether [if] when
we are not sure about something.
I
didn’t buy it because I wasn’t sure whether
you’d like it.
I
spoke to the others, but I don’t know whether
they’re coming.
We’ll
be late unless we leave now. [if
we don’t leave now]
Unless the weather
improves [if the weather doesn’t improve], we won’t be able to go.
I
have to go now, otherwise
[because if I don’t] I’ll miss the last bus.
You’ll
have to turn up the music, otherwise
[because if you don’t] they won’t be able to hear it.
You
can borrow it as long as you
bring it back by Thursday. [but you must bring it back]
You
can wear what you like as long as
you look quite smart. [but you must look quite smart]
I’m
taking my umbrella in case it
rains. [I’m doing A because B might happen later.]
Take
some money in case you need to
get a taxi.
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