look out的用法和搭配

　　Look out for symptoms of depression.

　　留心看有无抑郁症状。

　　'Look out!' he shrieked.

　　“小心！”他尖叫道。

　　‘ Look out! ’ I hollered.

　　“当心！”我大喊一声。

　　I should look out if I were you!

　　如果我是你，我会小心的。

　　I'm just trying to look out for you

　　我只是想要为你着想。

　　What are the symptoms to look out for?

　　有哪些症状需要注意？