Don't sit there ( )nothing.Come and help me .A doing B and doing B 怎么错呢?

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Don't sit there ( )nothing.Come and help me .A doing B and doing B 怎么错呢?
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Don't sit there ( )nothing.Come and help me .A doing B and doing B 怎么错呢?
Don't sit there ( )nothing.Come and help me .
A doing
B and doing
B 怎么错呢?

Don't sit there ( )nothing.Come and help me .A doing B and doing B 怎么错呢?
doing nothing是动词现在分词做状语,修饰sit
如果加上and,就表示sit和do在语法上是并列关系,两者的形式也要一致,由于前面sit用的是原型,所以do也要用原型,不能用doing.

sit , doing 时态不一致,不能用and连接

要是b的话要谓语一致
就是and do。。和sit 一致

doing是现在分词做状语,所以不能加and
如果加and 就应该是:and do nothing.

and是连词,后面要接动词原形,选B的话要改成and do,选A这里表示一种伴随状态.

doing表示伴随状语,and doing不符合语法,因为已经有了谓语动词且本句为祈使句,要用也地用and do

doing nothing.是伴用状语,即伴随sit同时发生的动作
and doing 看似并列谓语,但是doing形式不对,用原形还能说得过去。
又如:He stood there telling us a story .他在那站着给我们讲故事了。

Bdoing改成do
Adoing是伴随状语