He had hardly arrived when it began to snow． Hardly _____________when it began to snow． We had hardly walked into the hall when the lecture started． Hardly _______ walked into the hall when the lecture started． _______________she gone to sleep than the telephone rang once more． _______________the boy reached the door than he came back．

had he arrived

had we

No sooner had

No sooner had

2)含有关连词组hardly…when和no sooner…than的两种句子结构表示“一……就……”。当hardly或no sooner位于句首时，要倒装。