時間狀語從句通常由after,before,when,while,as,once,till,since,as soon as等從屬連詞引導。此外還有一些特殊的形式引導時間狀語從句。
一、immediately,directly,instantly用于as soon as的意義時也可引導時間狀語從句。例：
I recognized her immediately/instantly I saw her.
I went home directly I had finished work.
The machine will start instantly the button is pressed.
二、名詞the moment,the minute,the instant用于as soon as的意義時也可引導時間狀語從句。例：
I want to see her the minute that she arrives.
We hadn’t met for 20 years,but I recognized him the moment (that) I saw him.
I recognized him the instant (that) I saw him.
三、名詞the day,the year,every time,each time,next time,last time等也可用作連詞，引導時間狀語從句。例：
He left Europe the year World War Ⅱ broke out.
The day (on which) he was inducted,he was not feeling well.
Every time he phones I always seem to be in the bath.
Each time he came to town he would visit our school.
He looked much worried (the) last time I saw him.
The very next time I saw her she was working in London.
He had no sooner/No sooner had he arrived than he was asked to leave again.
We had hardly begun/Hardly had we begun our walk when it began to rain.
She had scarcely entered/Scarcely had she entered the room when the phone rang.
He had barely/Barely had he arrived when he had to leave again.