(一) 与现在的事实相反
What type of automobile would you buy _____ ?
[A] if you have free choice to choose the cars available today
[B] if you are free to choose among all the cars available today
[C] if all cars available were free to be chosen by you
[D] if you were free to choose among all the cars available today
(二)与过去的事实相反(有时主句中的should have done表示责备或后悔)
_____ ,he would have come to class.
[A] If Mike is able to finish his homework
[B] Would Mike be able to finish his homework
[C] If Mike could finish his homework
[D] If Mike had been able to finish his homework
If the United States had not entered the Second World War,probably the 1940 unemployment rate of 14% _____ still further.
[A] would rise
[B] would risen
[C] would have risen
[D] had risen
Topgrade [A] diamonds had not [B] increased so sharply [C] in value in the late seventies [D] if one company had not controlled almost all of the world’s supply.
(三)与将来的事实相反
The report would be [A] released last January if new developments had not [B] made it necessary to revise all conclusions drawn from [C] the first series of [D] experiments.
It is said Tom will go to an appointment tommorrow. If he were to come tomorrow, I _____ ask him to go to your place.
[A] will
[B] would
[C] shall
[D] might
If you _____ to see Mary,what would you tell her?
[A] are
[B] will be going
[C] must
[D] were
(四)与将来的事实可能相反
(1) If it should rain tomorrow, I would stay at home. 要是万一 明天下雨,我就呆在家里不出去。 事实上 现在天气很好,明天下雨的可能性应该不大,不过也说不准。
(2) If I should see her next Monday, I would tell her about it. 如果下周一我能见到她的话我就把这件事告诉她。
三、例题解析
D为正确答案。
D为正确答案。
C为正确答案。
B错。改为would have not。
A错。改为would have been。
B为正确答案。
D为正确答案。