高中英語(yǔ)語(yǔ)法-幾種容易混淆的時(shí)態(tài)比較(二)之二

幾種容易混淆的時(shí)態(tài)比較(二)之二
bsp; be back
fall asleep/go to sleep be asleep
1. 他已出去了。他出去了好幾個(gè)小時(shí)了。
2.他已睡著了。睡著了好一會(huì)兒了。
2、make sure/be sure表示采取措施以保證之意時(shí),從句中的時(shí)態(tài)用一般時(shí)或完成時(shí)。
1.Make sure that you ______(turn) off the light when you leave.
離開時(shí)務(wù)必關(guān)燈。
2.Make sure that you ________(finish) the work before six.
務(wù)必在六點(diǎn)前結(jié)束工作。
3.The hunter held his hand tightly to be sure that he didn't bow,either.
那位獵人緊握他兒子的手,以使他也不低頭鞠躬。
3、在時(shí)間狀語(yǔ)或條件狀語(yǔ)從句中,用一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí)表示一般將來(lái)時(shí),一般過去時(shí)或過去完成時(shí)表示過去將來(lái)時(shí)。
1.Tell him about that when he _______(come).
2.His daughter won't go to bed until she _______(finish) her homework.
3.We would get into trouble as soon as the gas _______( run ) out.