Mr.jones and his wife are looking at them.这里为什么用ARE 和AT.特别是A

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Mr.jones and his wife are looking at them.这里为什么用ARE 和AT.特别是AT,为什么不直接去掉AT?

主语是：Mr.jones and his wife （是两个人,琼斯先生和他夫人）,当然是复数,因此谓语用be的复数形式 are啊
look 是不及物动词,后面不能直接跟宾语,如果要跟宾语要用介词at ,即：look at sth.看什么东西
再问：是因为这样，我知道ARE 是用作复数，但我一直认为指人物以及物品。在这里我一直理解为可以说成Mr.jones and his wife looking them.那我再请问一下你，LOOK在任何形式下，都要加AT吗？LOOK AT 是必须连在一起吗？有什么情况是不需要连在一起呢？谢谢啊，因为我在家里自学英文，遇到问题只能向你们求救啦～～
再答：只有表示：看什么东西、看什么人的时候用look at 如果要表示看上去怎么样，不用look at，直接用look, 如：He looks cute。他看上去很可爱还有look for寻找 / look through 浏览，温习；看穿，识破 / look up 仰望；查阅；尊敬 / look down 看不起、往下看/ look forward to 期望、期盼，也就是跟不同的介词或副词，look的意思都有不同，成为固定短语的意思了，要分别记住的关于用are，是因为这里用的时态是现在进行时，构成：be doing，因此要加be(这里be仅帮助构成时态，是助动词)

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