为什么look at sth不能用look sth at

为什么look at sth不能用look sth at look at doing sth look at sth.=have a look at sth. look at sth,or watching look at sth 与look的区别. look up sth.和look up at sth.的区别 用look at sb/sth造句 look+什么词性的词+at+sth 为什么look after不能用look sth/sb after大神们帮帮忙 feel excited at sth为什么不用excitedly 不是有look happy和looK happily 造句：hear sb do sth .look at sb do sth.make sb do sth .notice 看比赛能不能用look at