1.i feel as if my heart __(stop) beating. 2.be careful !you ___(break) that chair. 3.when i get home,my wife____(watch) TV. 4.she didn`t mean ___(say) good-bye to him ,but she __(have to). 5.when __(ask)he answered at once .
1 stoped 表示与事实相反的假设,需用过去时。 2 may break 表示未发生的假设,用情态动词。 3 was watching 表示正在发生,过去进行时。 4 to say had to 固定搭配 mean to do sth,打算做某事, 后边的是过去时。 5 asked 表被动,为省略句,完整句应为:when he was asked he ...