分析“They are having lunch in the dining hall now.”这个句子的成分分析这个句子的成分属于哪一种类型?（如：S+V+O）

They are having an meeting What class are they having 是having happy they are 还是have happy they are They are interested ____English .,Now they are having ___English class They are having supper.(对having supper提问) when they are having a good they are all having a good time They are having a good time.中文 They are having fun here.[同意句] They are having fun _____in the park They are having a Chinesd lesson . They are all having a good time having.they.lunch.are.连词成句 They are having fun in the zoo they are having meal/a meal/meals? The students are having ___lessons now.(they) what fun they are having ___________(swim) now!what fun they are having ___________(swim) now! they are having good time,aren't they?是什么句子