if 表是否,则用什么时态?表如果,用什么时态?最好有例句。
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if 表是否,则用什么时态?表如果,用什么时态?最好有例句。
if 表是否,则用什么时态?表如果,用什么时态?
最好有例句。
if 表是否,则用什么时态?表如果,用什么时态?最好有例句。
如果：
zero conditional:100% 会发生的事：
If water reaches 100°,it boils.
如果水达到了100度,就会烧开了
if + present simple(reaches),present simple (boils)
first conditional：非常非常有可能 95% 会发生的事：
If you study more,you will pass this exam.
如果你更用功点,你就会通过这个考试
if + present simple (study),will + base form (will + pass)
second conditional:可能性不算很大 60%
If I had the time,I would study Italian.
如果我有时间的,我想学意大利语
if + past simple (had),would + base form (would + study)
third conditional:白日做梦
If I had won the lottery,I would have bought a bigger house.
如果我中了奖,我就想买一个大点的房子
if + present perfect (had won),would + present perfect (would + have bought)
是否:
要按照时间顺序：
I don't know if my father is here.
present(don't know),if + present (is)
我不知道我爸爸在不在这里
I don't know if my father has been here.
present (don't know),if + past simple/present perfect(was/has been)
我不知道我爸爸有没有在这里过
I don't know if my father will be here
present (don't know),if + future (will + base form)
我不知道我爸爸将来会不会在这里
I didn't know if my father was here
past simple (didn't know),if + past simple (was)
我当初不知道我爸爸在不在这里
I didn't know if my father had been here.
past simple (didn't know),if + past perfect (had been)
我当初不知道我爸爸有没有在这里过
I didn't know if my father would be here.
past simple (didn't know),if + conditional (would + base form)
我当初不知道我爸爸以后会不会在这里