Subordinate Clause Type

Example

Temporal

I'll ring you again [before I leave]

David joined the army [after he graduated]

[When you leave], please close the door

I read the newspaper [while I was waiting]

Conditional

I'll be there at nine [if I can catch the early train]

[Provided he works hard], he'll do very well at school

Don't call me [unless its an emergency]

Concessive

He bought me a lovely gift, [although he can't really afford it]

[Even though he worked hard], he failed the final exam

[While I don't agree with her], I can understand her viewpoint

Reason

Paul was an hour late [because he missed the train]

I borrowed your lawn mower, [since you weren't using it]

[As I don't know the way], I'll take a taxi

Result

The kitchen was flooded, [so we had to go to a restaurant]

I've forgotten my password, [so I can't read my email]

Comparative

This is a lot more difficult [than I expected]

She earns as much money [as I do]

I think London is less crowded [than it used to be]