【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? they are busy ----------model planes 填词 They are v-- busy(忙） They are busy p______ using computers now What are they busy 后用加doing吗?（Wat are they busy doing?) 是They are all busy and happy 还是They are all happy and busy? They are busy ________ (have) lunch.They are busy to have lunch.为什么看见有写的They are busy having lunch.都是对的么?为什么? Some of ____(they) are busy with the orange picking. They are always busy with lessons.同义句 theachers often c_ they are too busy every day They are busy ____(skate ) all the morning. They are busy all day这句话什么意思 They are busy __________________________________ (为运动会做准备). These days they are busy ( ) the farm work填介词 they are a____ busy with their lesson on weekdays they are busy _______(prepar) go on vacation. I don't often chat with my parents becouse they are busy(对划线部分 becouse they are busy提问 They are very busy.They are study ________ exams.填介词