We're going to have a barbecue if it's sunny. We're going to have a barbecue if it's sunny.
If and when are conjunctions.
=====Construction=====
| Joining two parts of a sentence | At the beginning of a sentence |
|
I worked in Paris when I was young.
|
When I was young, I worked in Paris.
|
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I'll give him your message if I see him.
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If I see him, I'll give him your message. |
=====Uses=====
| Conjunction | Use | Examples |
|
if |
To talk about something that might or might not happen
|
We'll cancel the barbecue if it rains.
"Would you like to go out tonight?" "Yes, if I'm not too busy."
|
|
when |
To mean 'at a time'
To mean 'every time' |
We were surprised when he told us about the new contract.
I always go by train when I visit my mother in the south.
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I'll be late if I don't leave now.
Call me back when you have the information.
I usually take my husband to the airport when he travels on business. He calls me every day if he remembers!