这有一支笔.那没有(一支笔).

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Here is a pen,there isn't a pen.

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Here is a pen, not there.

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楼上严重语法错误,很基本的therebe句型, ereisnobodyhere.这里没人

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erenot.

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应该是　Here is a pen. There is not.

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Here has a pen.There hasn't a pen.