英语否定句have/has+not.为什么在后面加过去式动词..It rained very hard last night.(so hard for six months)It hasn't rained so hard for six months.He flew his plane in bad weather.(never...such bad weather before)He has never flown his

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英语否定句have/has+not.为什么在后面加过去式动词..It rained very hard last night.(so hard for six months)It hasn't rained so hard for six months.He flew his plane in bad weather.(never...such bad weather before)He has never flown his
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英语否定句have/has+not.为什么在后面加过去式动词..It rained very hard last night.(so hard for six months)It hasn't rained so hard for six months.He flew his plane in bad weather.(never...such bad weather before)He has never flown his
英语否定句have/has+not.为什么在后面加过去式动词..
It rained very hard last night.(so hard for six months)
It hasn't rained so hard for six months.
He flew his plane in bad weather.(never...such bad weather before)
He has never flown his plane in such bad weather before.
不是否定句加原型动词的吗?..

英语否定句have/has+not.为什么在后面加过去式动词..It rained very hard last night.(so hard for six months)It hasn't rained so hard for six months.He flew his plane in bad weather.(never...such bad weather before)He has never flown his
括号里面的短语表示时间段,意思是这么长时间以来.
所以要用现在完成时,表示已经,如第一题：要改为符合括号内的条件,意思就变成六个月以来很久都没下过（注意“过”这个字）这么大的雨了.现在完成时的结构就是have +动词的过去分词,表示“已经”,或者“曾经”.
第二句话就是要你按照括号里面“从没有在如此恶劣的天气下.过（注意这个“过”字）”的条件来改句子,完成时之前提过,表示 “曾经”,所以才会用have+flown(fly的过去分词）来表示.
对于现在完成时的含义你要是还不懂的话,多看一下它的例句,相信你可以看得懂的.

只解释一个吧。昨晚下了很大的雨。后一句是已经六个月没下这么大的雨了。后一句是从过去某个时间（此处指六月前）到过去（也许是昨晚，也可以是六月前后的某天）一直持续的动作，所以要用过去完成时，又因为其是否定涵义，所以用hasn't rained...

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只解释一个吧。昨晚下了很大的雨。后一句是已经六个月没下这么大的雨了。后一句是从过去某个时间（此处指六月前）到过去（也许是昨晚，也可以是六月前后的某天）一直持续的动作，所以要用过去完成时，又因为其是否定涵义，所以用hasn't rained

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不一定例如I want to eat an apple 加动原是因为want to do sth

现在完成时：have+done
这种时态表示之前的对现在的影响，一般跟一段时间。

否定句不一定加原型。再说了，第二个句子还是过去式。O(∩_∩)O~

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