To和for的用法:
一、當(dāng)表達(dá)緣由時(shí):
to和for都可以使用,但to此時(shí)是不定式的用法,后接動(dòng)詞原形,而for則直接后接名詞,如:
I went to the supermarket to buy apples.
I went to the supermarket for apples.
二、當(dāng)表示“給予”時(shí):
此時(shí)的to和for后面都可以接動(dòng)作的對(duì)象,但用to時(shí)往往意味著句子的謂語動(dòng)作會(huì)發(fā)生方位變化(事物從一個(gè)地方移到另一個(gè)地方),for則沒有,如:
I made a cake for her.
I gave a cake to her.
三、當(dāng)表達(dá)目的時(shí):
此時(shí)與第一條類似,to用作不定式后接動(dòng)詞原形,而for則直接后接名詞,如:
I asked her to give me the key.
I asked her for the key.