举例说明 及物动词（必须有动作承受对象的）后面才能跟宾语

动词分为及物动词(vt)与不及物动词(vi).
及物动词(vt)可以直接加宾语.
如:I saw(see的过去式)you yesterday.
不及物动词(vi)要加介词再加宾语.
如:I looked at you just now.
at就是介词.