no sooner than

…than than when

no sooner …than…= hardly…when…一…就…., 剛剛…就…
No sooner / hardly + 過去完成時,than / when + 一般過去時
如果no sooner, hardly 位於句首, 主句要倒裝.
He had hardly sat down to have a rest when the door bell rang and in came Allan.
No sooner had he got off the train than his daughter ran towards HIM.
Hardly had we arrived when she started crying to go home.