英语翻译

英语翻译
三句英语,我不需要直接在百度翻译的.
句子里的有什么短语或是句型,格式什么的,麻烦单独说下,
1.No sooner hadthe thief disappeared into a side street than the police arrived.
2.At one time we had about eighty people here who did nothing but research into his family
history.
3.All of themstared at him carefully ,as though trying to understand something.