May / would / could (Guest:Lamboo)

he could come and hecould have come this two words what is mining?

Welcome to EnglishForums.

Unfortunately, your request is too broad to answer in a forum post. These kinds of expressions have many meanings and many uses. They deal with necessity, possibility, ability, advisability, probability, permission, obligation, willingness, refusal, futurity, and on and on!

Many books have been written on the subject of English modals. I recommend using the Internet to locate a few books on the subject of modal verbs in English. You might also try a library.

It won't be possible to learn all of their uses all at once. It will take quite a long time to master them, so you will need to be patient.

That said, here's a few basic facts:

The modals are: will, would, shall, should, can, could, may, might, and must.
They never change the way other verbs do. They don't add "s" or "ed".
They are followed by a bare infinitive or by "have" and a past participle.

CalifJim

What is the most important diference betwen can and could?

he may come . is mean that he may come here
he may have come is mean that he may be come but he does not come

Generally "would" is used to express desire. For example

I would like to ask you a question.

I would love to go there.

On the other hand "could" is used express capability or permission. For example

I could go there. ( I have everything needed to go there. I have capability to go there. I am allowed to go there). The meaning changes slighly based on the situation we are referring to.

Science_guru