急 Have you ever helped disabled children?把have换成did有影响吗?为什么是helped呢？

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急Haveyoueverhelpeddisabledchildren?把have换成did有影响吗?为什么是helped呢？急Haveyoueverhelpeddisabledchildren?把ha

急 Have you ever helped disabled children?把have换成did有影响吗?为什么是helped呢？
急 Have you ever helped disabled children?把have换成did有影响吗?
为什么是helped呢？

急 Have you ever helped disabled children?把have换成did有影响吗?为什么是helped呢？
用have 是完成时表示到目前为止一种持续的状态
用did 是过去式表示过去发生的动作

当然了。did 表示过去式，怎么后面还能用helped？

你好，首先把这句话变成陈述句，如下：
I have ever helped disabled children.

句中 ever 是曾经，去掉之后就是：have helped （现在完成时）

如果把 have 改成 did 后，陈述句应该是：
I helped disabled children
句中 helped （一般过去时）<...

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你好，首先把这句话变成陈述句，如下：
I have ever helped disabled children.

句中 ever 是曾经，去掉之后就是：have helped （现在完成时）

如果把 have 改成 did 后，陈述句应该是：
I helped disabled children
句中 helped （一般过去时）

两种时态不一样

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