虚拟语气中什么时候用should have done 什么时候用should be done
虚拟语气中什么时候用should have done 什么时候用should be done
日期:2013-01-22 22:23:26 人气:3
、表示与现在事实相反的情况:
从句:If 主语+过去时(Be动词用were)
主句:主语+should/would/could/might+do:
1.If I were you,I would take an umbrella.
如果我是你,我会带把伞。(事实:我不可能是你)
2.If I knew his telephone number,I would tell you.
如果我知道他的电话号码,我就会告诉你。(事实:不知道)