Question

no sooner …than的用法，前后时态的用法

Answer 1

no sooner....than 固定用法"一...就..."
引导时间状语从句,主句用过去完成时,"than"后面的从句用一般过去时.(从这里可以知道,no sooner后面是主句;than后面是从句)
例:
I had no sooner reached home than it began to rain.
我一到家天就下起雨来
No sooner ...than...常放在句首,表示强调.这时主句要倒装.
例:No sooner had I reached home than it began to rain.
与这个短语类似的还有 hardly ... when
意思为:"还没...就..."
例:
We had hardly gotten there when it began to rain.
我们还没到那儿,天就下起雨了.
(主句用过去完成时,从句用一般过去时)

Answer 2

no sooner....than 固定用法"一...就..."
引导时间状语从句,主句用过去完成时,"than"后面的从句用一般过去时.(从这里可以知道,no sooner后面是主句;than后面是从句)
例:
I had no sooner reached home than it began to rain.
我一到家天就下起雨来
No sooner ...than...常放在句首,表示强调.这时主句要倒装.
例:No sooner had I reached home than it began to rain.
与这个短语类似的还有 hardly ... when ，scarcely,,,when
意思为:"还没...就..."
例:
We had hardly gotten there when it began to rain.
我们还没到那儿,天就下起雨了.
(主句用过去完成时,从句用一般过去时)

三个“一...就..." ，no sooner ...than，as soon as,hardly ..when 的区别
网上有很多讲的很复杂的，我就不再赘述，我的这个解释是最最简单明了的：
从一怎么，就怎么的时间来排序：
as soon as >no sooner ...than>hardly ..when
比如，我一到伦敦，就给你打电话，用as soon as ,这个打电话和到伦敦的间隔时间可以比较长，比较从容
我一到伦敦，就（忙着）找旅馆，用no sooner than,这里的间隔时间已经比as soon as 短了，有点着急
我还没来得及住旅馆，信用卡就丢了，（或，我刚做完试卷，铃声就响了）用hadly ,,,when,这里一怎么，就怎么，反应了勉强，结结巴巴的状态。

Answer 3

no sooner引导的句中用过去完成时，than引导的句中用一般过去时
no sooner位于句首，句子主谓须倒装

Answer 4

no sooner +过去完成时 than +一般过去时
一。。。就。。。

Answer 5

"一...就..." 的意思。
主句常用过去完成时,从句用一般过去时