The following is the statement of ability and inability from source “English Revolution” book:

Ability Inability
S + can + V1 + O S + can + not + V1 + O
S + is/am/are + able to + V1 + O S + is/am/are + not + able to + V1 + O
S + is/am/are + capable of + V.ing + O S + is/am/are + not + capable of + V.ing + O
S + have/has + capability to + V1 + O S + have/has + no capability to + V1 + O
There’s a chance that + S + can + V1 + O There’s no chance that + S + can + V1 + O
S + know how to + … S + don’t/ doesn’t + know how to + …
S + to be + good at … S + to be + not + good at …

The following is the statement of expressing request from source “English Revolution” book:

Request Responses
Would you/ will you …? Yes, of course
Won’t you …? I’m afraid I can’t
Could you/ can you …? Certainly
Would you like to … Emmm, alright
Would you mind + V.ing … Of course not

The following examples of a conversation someone who able and willing to do something:

1.  The ability someone to perform an action

woman: “can you play the guitar?”

man: “yes, I can

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man: “can you come to my party?”

woman: ” I’m sorry, but I cannot”

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Birds can fly because they have wings. We don’t have wings, so we cannot fly. But we can make planes, with the planes we can fly very high.

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2.  The willingness someone to perform an action

man 1: “Ali, will you come to my party?”

man2: “of course, I will

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man 1: “John, will you go to the canteen with us?”

man 2: “sorry, I must go to toilet”

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That’s some examples of the ability and willingness to do something. In conversations that can accept and reject about the ability and willingness.

Thank you for visiting this blog. May be useful. Amin ?