Use of Would, could and should

[ashokrajani]

Please tell me when to use Would, could and should and how? please explain with some examples and using these words in sentences.
Also, if you can explain what is the impact of each word.

[pliang]

perhaps the following might help:

Would = a formal form of "will"
would like to = a formal form of "want to"
I would like to (want to) have more food
I would like to (want to) go but....
It would/will not be the same without you

could = a formal form of "can"
I could/ can read it
I couldn't/ can't read it


should --> Subject + should + Verb = You should study hard (the speaker asked you to study hard)