How do we use the "modal verbs" correctly?

[Ioana]

Test No. incompl/elem-7 "Modals", question 4

I may ......... able to come to your party if I have the time.

(a) be
(b) being
(c) being to

Test No. incompl/elem-7 "Modals", answer 4

I may be able to come to your party if I have the time.

Correct answer: (a) be
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How do we use the "modal verbs" correctly?

Ioana

[Alan]

May is like can and must because the following verb is in the infinitive form. The correct answer is: I may BE able to come.
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English as a Second Language
You can read my ESL story Future

[Amiranow]

Hi,
I think "no one say ; I may be able ....". I used to hear "May be able to.....".

[Mister Micawber]

.
I'm not sure what you are asking, Amiranow, but the phrase, "I may be able to" + verb is a common phrase to express possibility.

We may be able to explain more to you if you clarify your question.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber

[Amiranow]

Hi,
You have already answered me . I want to say it isn't commonly used in offering but you tell me it's used to express how much it's possible .
Thanks