4．有些关联从属连词，如 no sooner … than / hardly … when / scarcely … when / barely …when 等，也能引导时间状语从句。 △ 如果把no sooner, hardly, scarcely, barely置于句首，它所连带的这部分就要倒装，如： She had no sooner heard the news than she fainted. No sooner had she heard the news than she fainted. They had hardly started to work when the trouble began. Hardly had they started to work when the trouble began. He had scarcely entered the room when the phone rang. Scarcely had he entered the room when the phone rang.