tom【】ready to help the old peopleis be am are 哪个?

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tom【】ready to help the old peopleis be am are 哪个?
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tom【】ready to help the old peopleis be am are 哪个?
tom【】ready to help the old people
is be am are 哪个?

tom【】ready to help the old peopleis be am are 哪个?
is 第三人称用单三形.be 可以说是is ,am ,are的原形,在要添动词原形的时可以用be.

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