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Sentence Correction: Subject Verb Agreement - Ving/to V Subject

To know English mean to be able to communicate with billions of people around the world.

Very good!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb mean to the singular verb means to match the singular subject To know.

Incorrect.

This answer choice is grammatically incorrect: the singular subject to know English does not agree with the plural verb mean.

Incorrect.

This answer choice repeats the original mistake: the singular subject to know English does not agree with the plural verb mean.

To know English mean to be able to communicate with billions of people around
Knowing English mean being able to communicate with billions of people around
Knowing English mean to be able to communicate with billions of people around
To know English means to be able to communicate with billions of people around
To know English mean to be able to communicate with billions of people in