be单用与be+being所表达的意义不同，be+being用于表示某人短暂的活动和行为，不用于表示人的心境。
- You are really being annoying/careful.
你真是烦人/仔细。 - She was being terribly energetic.
当时她非常有活力。 - You were being stupid (=You were behaving stupidly).
你当时真傻。 - He's very happy/angry/tired/depressed.(不用be+being)
他非常幸福/生气/疲惫/沮丧。
＊注意下面句子的差别：
- He's being sick. (=He's vomiting.)
他要呕吐。 - He's sick. (=He's ill.)
他病了。 - You' re being very patient with me.
你对我真是耐心。 - He's very patient.(always)
他总是非常耐心。 - Lily is being good today.
莉莉今天很乖。 - Lily is a good girl.(always)
莉莉(一直)是个乖女孩。
