【急】they are busy cleaning 这里面的are 做什么成分?

【急】they are busy cleaning 这里面的are 做什么成分? 帮我分析下下面那句话they are contributing(这里是什么词做什么成分 very little of r they are difficult to make 这里的不定式、做什么成分 they are bound to be defeated in the match.这里不定时做什么成分啊? The students are cleaning the classroom.They are busy.(合并成一句 They are cleaning the house. They are cleaning the window 这里“when they come ”做句子的什么成分 求高手分析这个句子的各个成分：you are what you say you are.到底what在这里做什么成分? 求 they are cleaning my room.的问句 They are (cleaning the room).对括号里面的提问. They students are cleaning the classroom 对cleaning the class