什么时候是look up them ,什么时候look them up?

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什么时候是lookupthem,什么时候lookthemup?什么时候是lookupthem,什么时候lookthemup?什么时候是lookupthem,什么时候lookthemup?什么时候也不能

什么时候是look up them ,什么时候look them up?
什么时候是look up them ,什么时候look them up?

什么时候是look up them ,什么时候look them up?
什么时候也不能look up them it them 必须放短语中间如果是名词可放中间或后边

look up them,放在句中
look them up 置于句末一半代词不能放在句末的

可以换用。。。但是通常it them一类的代词需要放在介词up to等等的前面。。。而名词放在up 同等等的后面。。所以用look them up比look up them要好。。。。
但是需要看看具体情况，因为有些时候在这么个用法之后还有有to ...作为状语等等，为了避免歧义的时候会选择其中的某一个（要看具体情况了，我一时没有想起什么例子）
如果是祈使句，命令、感叹等等语气（也...

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什么时候是look up them ,什么时候look them up? 像look=（代词）up 一类什么时候代词放中间?look them up可以,那look them for为什么不行? look them 中间是? 是look after them,还是look them after? look it up与look them up有什么区别,怎么用翻译：pull your covers up and make them look neat 是cheer them up还是cheer up them look them look them look them look at the paper on the floor,please pick it up 还是 pick them up? If you don't know the words,you can _____in a dictionary.A.look it up B.look up them C.look them up D.look up it选择. look up look up look up look up don't be afraid of new words .you can __ in the dictionary.A.look at them B.look for them C.look them up D.look them over look up和look