There()a pair of shoes under the bed.A.are.B.isC.There()a pair of shoes under the bed.A.are.B.isC.am What()in the bathroom.A.are.B.is C.am老师讲答案是am两题都是am和is在什么情况下用区别是什么:

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There()a pair of shoes under the bed.A.are.B.isC.There()a pair of shoes under the bed.A.are.B.isC.am What()in the bathroom.A.are.B.is C.am老师讲答案是am两题都是am和is在什么情况下用区别是什么:
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There()a pair of shoes under the bed.A.are.B.isC.There()a pair of shoes under the bed.A.are.B.isC.am What()in the bathroom.A.are.B.is C.am老师讲答案是am两题都是am和is在什么情况下用区别是什么:
There()a pair of shoes under the bed.A.are.B.isC.
There()a pair of shoes under the bed.A.are.B.isC.am What()in the bathroom.A.are.B.is C.am
老师讲答案是am两题都是am和is在什么情况下用区别是什么:

There()a pair of shoes under the bed.A.are.B.isC.There()a pair of shoes under the bed.A.are.B.isC.am What()in the bathroom.A.are.B.is C.am老师讲答案是am两题都是am和is在什么情况下用区别是什么:
B.is
  am主语一定是I;is主语为第三人称单数

B a pair of
B What
两题都是is、
am通常一定跟在主语I后面,is通常为三单
可追问、望采纳