Alternative conditional forms

Other expressions in conditionals

unless (=if...not)

We won't go on holiday unless we save some money.I can't sleep unless it's very quiet outside.

when

(repeated or predictable situations)

- It's especially irritating when the dogs start barking

In case

(something might happen)

- I'll take my umbrella in case it rains.- Make sure your phone's on in case I need to call you.

as long as / provided (that) / providing (that) / on condition that / only if

- I'll tell you what really happened as long as you keep the secret.- She'll only go on condition that she sells her flat first.

suppose/supposing

(what if...?)

- Supposing I got a job, I wouldn't be able to travel with you next summer.- Suppose she doesn't believe you, what would you do?