Verb grammar rule

[english_learn]

-skills required for effective communication

Is the above sentence correct? I think it should be as follows.

skills are required for effective communication.

Please advice me grammar rule

[SoothingDave]

That's not a sentence. Provide the entire sentence, or even more context, and then we can see what is proper.

[sunsunmoon]

Writing and speaking skills are required for effective communication.
Grammatically correct?

[SoothingDave]

Writing and speaking skills are required for effective communication.
Grammatically correct?

Yes.

But the text given in the original post could be correct, for example:

None of the candidates interviewed had the skills required for effective communication.

[english_learn]

- None of the candidates interviewed had the skills require for effective communication.

Is it correct? if not why

[SoothingDave]

No, it's "skills required." When a verb (require) is used as an adjective (to describe "skills") we use the past participle form (-ed).

The given changes. The contract offered. The tickets acquired.