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现在进行时和过去式的区分.高手进

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现在进行时和过去式的区分.高手进
有几道题不太懂,麻烦讲解一下.
1.The thief ( )in from the kitchen window as all the other windows and doors were closed
A.may climb B.must have climbed C.could climb D.should have climbed
2.I am sorry to keep you ( )for a while ,for there is no chair .
A. stand B.standing C.stood D .to stand
3.We saw him ( )off the tree two days ago.
A.fell B.fall C.to fall D.faided
4.She ( ) (not play ) football these days .
5.How long ( )your uncle ( )(live)in Beijing.
请详细解答.谢谢~~~
另外.如何区分过去式和现在进行时,不要像是课本的.越通俗易懂越好
谢谢,可另给分.
额 错了 ~~~是现在完成时...
1.b 现在完成时,小偷爬厨房的窗户对这几件事有影响.
2.b keep doing sth 继续做某事
3.a see sb do sth
4.haven't play these days是现在完成时标志
5.have lived 住在北京是过去的事,并且现在还在北京,对说话人这句话有一定的影响,所以用现在完成时.
现在完成时指,过去发生的事,并且一直持续到现在,并且对现在有一定的影响.