例如什麼詞性 for後面通常用什麼

for有兩種用法。

一是作介詞，後面接名詞、動名詞、代詞、一般疑問句和特殊疑問句作賓語，可表示目的或原因，例如：Researchers have proposed several explanations for why interruption of glucose processing might retard aging

二是作引導詞，後面接陳述句，引導原因狀因從句，表示“因爲，原因在於”，例如：They are less fully  given back to the water，for they still lay eggs on the beaches.