7. 條件類
1.) unless(conj) used to say that something will happen or be true if something else does not happen or is not true
例句:He won't go to sleep unless you tell him a story

2.) once (conj):from the time when something happens
例句:Once in bed, the children usually stay there.


3.) as/so long as:
a)used to say that one thing can happen or be true only if another thing happens or is true:
例句: You can go out to play as long as you stay in the back yard.
b) used to say that one thing will continue to happen or be true if another thing happens or is true at the same time:
例句:As long as we keep playing well, we'll keep winning games.

4.) if=suppose that=supposing that=provided that=on condition that=only if
5.) in case
例句:
In case I'm late, start without me.

6.) in the even that
7.) whether…or not
8.) but/only that