if If you are a tear in my eye, I will never shed it.
已经写好的句子时态，变成它的过去式。并且be动词的过去式只有ware。还并且would=could=might
If you were a teat in my eye, I would never shed it.
If I was a dog last night, I could sleep in bed with you.
过去式的过去式 = 过去完成式
一般过去时（有确切的时间点）和现在完成时（可以表示过去，没有确切时间点）都表示过去。
If I had been a dog last night, I could have slept in bed with you.
If every student is(were) indulged in/addicted to short videos, he will(would) achieve nothing until the end of his life.
if there are (were)no clouds, we will(would) never enjoy the sun.
If I [had] worked hard at that time, I could [have] succeed(succeeded).
If he goes(went) to Peking University. he will(would) be sure to let the world know about it.
propose
The doctor suggested that I (shoud) eat more vegetables.
It is necessary that a college student (should) master a foreign language.
My proposal is that students (should) review and summarize by themselves instead of just listening to the lecture.
It is suggested that all dogs (should) be kept on a leash in public places.
It is quite necessary that students (should) be aware of the meaning of learning motivation and methods.
if only 如果。。。该多好啊
I wish I will(would) be your angel and protect you in the future.
I wish there were fewer bad guys in the world.
I wish their son had not been(was not) there when they quarreled in the street yesterday.
When I was young, He treated me as if I was(had been) his own son.
Today's words
1 cordial
He had never known him to be so chatty and cordial.
2 cough
Dirt from the motorway made him cough.
3 corn
She pounded the corn kernels.
4 council
The members left the council chamber.
5 counsel
He had always been able to count on her wise counsel.
6 coronavirus
The coronavirus broke out.
7 corporate
He lost his job in a corporate takeover.
8 counterpart
The Foreign Minister held talks with his Chinese counterpart.
9 correlate
The figures do not seem to correlate.
10 correspond
Your account and hers do not correspond.
11 county
Every autumn I go to the county fair.
12 correspondence
We have been in correspondence for months.
13 coupon
He paid with a two-for-one coupon.
14 corridor
She ran out into the corridor.
15 courage
He showed courage in adversity.
16 corrode
The tools will corrode with rust if never used.
17 corrupt
Power tends to corrupt.
18 court
The court adjourned for lunch.
19 cosmic
NASA plans to launch a satellite to study cosmic rays.
20 courtesy
I was treated with the utmost courtesy by the staff.
21 costly
The best equipment is costly but is well worth the outlay.
22 costume
The costume designs are too fussy.
23 cosy
The overall ambience of the room is cosy.
24 cottage
The cottage was cold and damp.
25 cow
A cow stood on the tracks.
26 coward
You coward! What are you afraid of?
27 cotton
The sheets are 100% pure cotton.
28 crab
I can't remember when I last had crab.
29 couch
She slipped out of the jacket and tossed it on the couch.
30 crack
The ice started to crack.
31 cradle
She rocked the baby to sleep in its cradle.
32 criticise
This isn't really what my wife is trying to criticise me about.
33 craft
He has a genuine and abiding love of the craft.
34 criticism
He shrugged off the criticism.
35 crane
The cargo was hoisted aboard by crane.