Explanations:In English grammar, subject-verb agreement is a fundamental rule that ensures the subject and verb in a sentence agree in number and person. This means that if the subject is singular, the verb must also be singular, and if the subject is plural, the verb must be plural. The question at hand involves the third person singular subject "My mom," which requires the verb to be in its singular form.
The verb "sing" is a regular verb, and in the present tense, the third person singular form is "sings." This is because we add an -s or -es to the base form of the verb when the subject is he, she, or it. For example, "He sings," "She sings," and "It sings" are all correct forms of the verb in the present tense for third person singular subjects.
Option A, "Sing," is incorrect because it is the base form of the verb and does not agree with the third person singular subject "My mom." The base form "sing" is used for first and second person subjects (I, you, we, they) or for plural third person subjects (they).
Option C, "Is sing," is incorrect because it is not a grammatically correct construction. The correct form would be "is singing" if the continuous tense were intended, but the simple present tense requires "sings." The continuous tense is formed with the auxiliary verb "is" followed by the present participle form of the verb, which in this case would be "singing."
Option D, "None of the above," is incorrect because there is a correct answer among the given options, which is "sings."
Therefore, the correct answer is "B) Sings," as it correctly matches the third person singular subject "My mom" with the appropriate form of the verb in the present tense.