when: Don't get excited when you talk. 講話時別激動。

while: We must strike while the iron is hot. 我們要趁熱打鐵。

as: He smiled as he passed. 他經過時笑了笑。

before: It will be five years before we meet again. 要五年后咱們才能再相見。

after: I'll tell them after you leave. 我將在你走后告訴他們。

until, till: I propose waiting till the police get here. 我建議等警察來了再說。

since: How long is it since you came to London? 你到倫敦有多久了?

whenever: Whenever it is possible, they play outside. 一有機會他們就到外面玩耍。

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