could/would

[rafeezah]

please explain me the usage of could and would in past and future tense.
i have seen people using them in both tenses.and explain me how they are different from can and will.

these are few examples.please let me know if they are correct and explain me.

he would be doing it tomorrow .
he will do it tomorrow.
he will be doing it tomorrow .
he would have done it yesterday.


he could do it tomorrow.
he can do it tomorrow.
he could have done it yesterday.

 

[Raymott]

please explain me the usage of could and would in past and future tense.
i have seen people using them in both tenses.and explain me how they are different from can and will.

these are few examples.please let me know if they are correct and explain me.

he would be doing it tomorrow .
he will do it tomorrow.
he will be doing it tomorrow .
he would have done it yesterday.


he could do it tomorrow.
he can do it tomorrow.
he could have done it yesterday.

That's an awful lot of grammar you're asking for.
You want to know how to use half the modals: can, could, will, would in all the tenses.
This is covered in most grammar books - generally over three or four large chapters. One way you could get a better answer is to try to answer these questions yourself, post your answers (over several posts), and someone will comment on them. (I will if no one else does).