should do 和should have done怎么解释

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• 1.some people,now,lie,in the sun(现在进行时) 2.my aunt,the floor,this afternoon,sweep（一般过去式）3.have a picnic,we,this Friday,in the park(一般将来时)4.你问什么不吃水果和蔬菜呢?（why don't）5.尽量不要太晚睡觉（try to）6.想再去看电影怎么样(how/what about)7.在这里建医院是一个好主意（it's a good idea···）8.我们应该在九点半之前到达那里（should）
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