1．look at…看…，look like … 看上去像……，

       look after …照料…

    2．listen to…听……

    3．welcome to…欢迎到……

    4．say hello to …向……问好

    5．speak to…对……说话

    此类短语相当于及物动词，其后必须带宾语，但宾语无论是名词还是代词，都要放在介词之后。如：

    This is my new bike. Please look it after. (×)

    This is my new bike. Please look after it. (√)