例 There is a book on the floor,please pick it up.
Please pick up the book.
类似的有 look up,think 等
例A: I don't konw this word.
B:you can look it up in the dictionary.
像look after take after take care of 等,不管是名词还是代词都要放在词组之后
例子Do look after our parents.
My dog is very naughty,help me look after it .