Difference between could, would and should

[nandhusri2007]

How and where to use "Could", "Would" and "Should" ?

 

[Nightmare85]

***Neither a teacher nor a native speaker.***

I found some threads:
https://www.usingenglish.com/forum/ask-teacher/69396-using-should-would-could-must-might.html
https://www.usingenglish.com/forum/ask-teacher/23708-could-would-how-use-them-properly.html

Cheers!

 

[e2e4]

There is no short answer to your question because they are used a lot a lot.
The explanation would took at least ten pages.
All three belong to modals. Modals never change their form.
(can, must, ought to, shall, will, should, could, might, would, may)
On the other hand they always change all in which they participate.;-)

Modals are chiefly used in the conditionals.
To say either what is permitted or what is possible or what is necessary.

Participate in forming many verb tenses.

Start reading about modals in a grammar book!
You should start reading about modals in a grammar book.
Could you start reading about modals in a grammar book? (Have you got a book?)
You should have started reading about modals long time ago. (You didn't)
Couldn't you have read anything about modals before asked the question. (Of course you could)
Would you mind my shoving you the usage?
I would help you if I could.
I would have liked to write a lot of examples for you.(but it wasn't possible)
If this examples should be seen as a bad manner I am sorry.

etc, etc