1.by的用法： ②经过 eg:He_________ _______ the post office.
③不迟于，去…之前：eg:I have to go to bed __/before 10 o’clock
④通过…的方式：eg:by (doing) sth
I studied English __________ reading and listening a lot .
注意对它提问用how
1） I studied English by reading aloud and listening a lot .
