Host: Jeffery 叶茼荞

　　Keep sb. posted

　　at short notice

　　be tied up

　　Practical Sentence

　　Keep sb. posted

　　eg: I’ll keep you posted as project starts.

　　at short notice

　　eg: They can’t arrive here at such short notice.

　　be tied up

　　eg: I am afraid she can’t call you, she is all tied up.