Let is catch it哪里不对

Let is catch it哪里不对 he told it is not possible哪里不对 let‘s catch it 怎么读? Let is catch the whit a Let is di it . how is it getting的句子吗?如果没有事语法成分不对吗?哪里不对 It is time to class.Let us go.哪里错了啊? what it is is 不对怎么改 Which flight are you to catch?这句话的语序哪里不对? let's catch let is call it a let is have dinner together 如果不对,应该怎么写?