Unit 2Section课前自主领悟课堂要点精析课后强化训练It is可用的三类词that(should)dosuggested,ordered,required,demanded,requested,proposed,desired等important,necessary,natural,strange 等a pity,a shame 等as if/as though时间谓语动词的虚拟形式与过去相反had过去分词与现在相反一般过去时(be动词用were)与将来相反would/could/might动词原形