(when he was watching) the notice, an idea came to his mind.括号里为何不能用Watching?不是非谓吗?

When he was a When was he at In a reward for his faithful service,he was given a watchIN A REWARD FOR是什么意思 短语?另外句子中的HE指的是谁. When was he born,为什么不是When was he bear? when was he born=--- ---- when was he ten 急用 he played when he was at when was he born关于姚明 when he was seventeen?的同义句 He was sleeping late when it arrived When was he born?的意思 when was he born 是什么时态 when he was a little boy John t_____ China when he was young. when he was five的同义词急 When he was d____ along zhe street He was in when I called. He___ ___ ___write when he was four