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

To live well mean to act well.

This answer choice is grammatically incorrect. The singular subject To live does not agree with the plural verb mean.

Remember that a subject in the form of To Verb is considered a singular subject

Right!

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 live.

This answer choice is grammatically incorrect. The singular subject Living does not agree with the plural verb mean.

Remember that a subject in the form of Verb+ing is considered a singular subject

Incorrect.

This answer choice is grammatically incorrect. The singular subject Living does not agree with the plural verb mean.

Remember that a subject in the form of Verb+ing is considered a singular subject.

Incorrect.

This answer choice repeats the original mistake. The singular subject To know does not agree with the plural verb mean.

Remember that a subject in the form of ToVerb is considered a singular subject.

To live well mean to act
To live well means to act
Living well mean to act
Living well mean acting
To live well mean acting