什么时候用for，甚么时候用to

Answer 1

for与to用法比较：
1. for和动词leave，start等连用，表示动作方向。例句：
They'll leave for Peking next week.
2. to和动词come，go，return，move等连用，表示动作的目的地。例句：
1）Are you going to the U.K?
2）When did you come to this country?
3）He's returned to Shanghai.
3. 表示间接宾语的关系。
（1）在give，pass，show，lend，bring，teach，write，throw，leave，return等动词的句子里，直接宾语在前，间接宾语在后时，间接宾语的前面加to。例句：
1）He gave the book to me.
2）She lend her bike to Mary.
（2）在buy，get，make，cook，sing，find等动词的句子里，直接宾语在前，间接宾语在后时，间接宾语前要加for。例句：
1）My father bought a bike for me.
2）My brother is making a kite for me.