.hypothesis: y-ai po-'pa: the-@e si-si
Enormous Astronauts went universe to confirm the hypothesis.
本来要做但没做
. would have done (it means as usual logic, it will happen. But actually it won't happen)
I would have passed the exam if I have tried a little hard.
.wouldn't have done
Without your help, I wouldn't have achieved so much.
. could have done ( it mean you can do it as usual)
I could have finished it on time without your disturbance.
Normal(more possibility)
. if ..., sb will/can ...
if I go to work on time, I will/can improve my reputation and reduce the loss of money.
.( plan to, want to，would like to)
If I have time, I intent to do more design job.
Detail:
1. 一般通俗的情况
less realistic
. If sb did ..., sb would/could/might do ...
If I had less work, I'd travel more.
. is were not was
If I were you, I'd do a course in programming.
Detail:
1. 自身的特殊情况
2. contrary to the present situation
Unrealistic
1. If sb had done, sb would have done
If I have finished my study, I would have achieve master degree.
If I had quited school, I wouldn't have been so successful.
Detail:
1. Contrary to the past situation
2. express regret
Contrary to the future situation
Shap:
. If s + should + v原型，s + could/ can + v
Apply:
If it sprinkles, I'll open my umbrella.
Detail:
. 万一，与pure condition 如果不一样
Contrary to the truth
Shape:
If s were to v(simple), s + should/... + do
Wish
shape
. S wish + clause
