坚吃不懈1208
1,应用tolearn,itistimetodosth=itistimeforsth2,Itishightimethat+从句该是...的时候了.从句后要用虚拟语气.如:Itis(high)timethatwegothome.我们该回家了.是我们该回家的时候了.Itis(high)timethatwewenttobed.我们该睡觉了.是我们该睡觉的时候了.
心海若冰
At present, the shortage of fresh water resources has become an urgent problem to be solved in the world.
密果儿小雨
1、这里的虚拟表示与过去事实相反从句用:If+主语+had+done主句用:主语+should/would/might/could+have done至于were,大概是以下这几种情况:1】如果表示与现在事实相反的情况:从句用:If+主语+过去时(Be动词用were)主句用:主语+ should/would/might/could+do:例句:If I were you,I would go to the class.(我不可能是你)2】表示对将来情况的主观推测:从句用:If+主语+were to do 或者If+主语+should+do或者If+主语+过去式(be动词用were)主句:主语+should/would/might/could+do例句:If he were to be here next Friday,Tom would be happy.例句:If there were a heavy snow next Sunday,we should cancel the show.3】还有,有时候从句和主句的时间不一定是一样的,具体情况要具体分析啊。
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