A有些动词只是及物动词;它们不可以单独用,后面必须跟宾语.

　　{False:Theyalwayswantafterlunch.

　　Right:Theyalwayswantacupofteaafterlunch.

　　{False:Heissendingnow.

　　Right:Heissendingaletternow.

　　B有些动词只是不及物动词；它们可以单独用,如果后面想接宾语,动词后面必须加上介词.

　　{Right:Heislookingaround.

　　False:Heislookingme.

　　Right:Heislookingatme.

　　{Right:Heislisteningcarefully.

　　False:Heislisteningtheteachercarefully.

　　Right:Heislisteningtotheteachercarefully.

　　C有些动词既是及物动词,又是不及物动词;但是有时候词义会改变.

　　{Thecustomerisaskingloudly.

　　Thecustomerisaskingforyounow.

　　Thecustomerisaskingaquestionnow.

　　{Ifyouworkhard,youwillsucceed.

　　Ifyouworkhard,youwillsucceedinpassingtheexam(samemeaning).

　　Ifyouworkhard,youwillsucceedJohnasthemanagerofthiscompany(differentmeaning英语中按动词后可否直接跟宾语,可把动词分成及物动词和·

　　不及物动词：字典里词后标有vi.的就是不及物动词.不及物动词后不能直接跟有动作的对象（即宾语）.若要跟宾语,必须先在其后添加上某个介词,如to,of,at后方可跟上宾语.具体每个动词后究竟加什么介词就得联系动词短语了.