write down的用法：write sth down與write down sth都正確。例如，write your ideas down，write down your ideas。

write your ideas down和write down your ideas兩個都對。

down是一個副詞，這是一個由“動詞+副詞”構(gòu)成的短語動詞，名詞作賓語時(shí)既可放在后面，也可放在中間；如果是代詞作賓語，只能夠放在動詞和副詞之間，不能放在副詞后面。再如pick it up;pick the book up,pick up the book都可以。

如果是“動詞+介詞”構(gòu)成的短語，無論名詞還是代詞作賓語，都應(yīng)放在介詞的后面，如look after your brother，look after him，而不能放在介詞的前面。

write down例句

After you've read it, please write down a few brief comments.

看完請簽個意見。

Write down (in order of priority) the qualities you'd like to have.

（按照優(yōu)先次序）寫下你想具有的品質(zhì)。

Write down the sort of thing you would like to do, given the opportunity.

寫下有機(jī)會的話你想做的事情。