以便于英语怎么说

He angled his chair so that he could sit and watch her.

他斜移了椅子，以便坐着观察她。

We perfected a hand-signal system so that he could keep me informed of hazards.

我们完善了一套手语体系，以便他能告知我危险。

They brought her meat so that she never went hungry.

他们给她带来了肉，这样她就再也不用挨饿了。

I'll give you a key so that you can let yourself in.

我把钥匙给你，你可以自己开门进去。

in case...so that...so...that...in order that...in order to...

可以用for表示为了，以便于。。。