目的状语从句和原因状语从句与主句一起构成完整的句子。

A purpose or reason clause needs a main clause to make a complete sentence.

youdao

正是因为她病了，她昨天才没去上学。（强调原因状语从句）

It was because she was ill that she didn't go to school yesterday.

youdao

人不能月球上生活， 因为那里没有空气和水。（译成原因状语从句）

Man can't live on the moon, where there is no air or water.

youdao

人不能月球上生活， 因为那里没有空气和水。（译成原因状语从句）

Man can't live on the moon, where there is no air or water.

youdao