The boy’s father told the boy that water freezes when the temperature drops below zero. 2. 从句中有具体时间状语,即使从句动作发生在主句动作前,仍然用一般过去时。 The teacher...
4.It is time + 主语+ 过去式(该是……的时候了) 例如: It is time the authorities concerned took proper steps to solve the traffic problems. 该是有关当局采取适当的措施来解决交...
更多内容请点击：一模还剩12天,初中英语最重要语法点!从选择题到作文,冲刺必看—— 推荐文章