When deciding between have to, must to, and has to, the correct choice for the sentence “She _______ do her homework” is has to. Understanding why this is the case involves looking at two fundamental rules of English grammar: subject-verb agreement and the structure of modal verbs.
Subject-Verb Agreement
The most important rule in this context is that the verb must match the subject in number and person. The subject “She” is a third-person singular pronoun. In the present simple tense, the verb “have” changes to “has” when paired with he, she, or it. While we say “I have to” or “They have to,” we must always use “She has to.”
- الاجابة : has to.
The Rule for “Must”
A common mistake for English learners is adding the word “to” after “must.” In English, must is a modal verb. Modal verbs (like can, should, and must) are followed directly by the base form of the verb without “to.” Therefore, while “She must do” is grammatically correct, “She must to do” is always incorrect. Since your options included the word “to,” “must” cannot be the right fit.
The Collective Nature of “Homework”
It is also worth noting a small detail regarding the word “homework.” In English, homework is considered an uncountable noun. This means it does not typically take a plural “s” at the end. To sound like a native speaker, it is best to say “She has to do her homework” rather than “homeworks,” regardless of how many assignments she has.
Summary
To complete the sentence correctly, you need a verb that agrees with a singular subject and functions correctly with the preposition “to.” Has to is the only option that satisfies both requirements, making the final correct sentence: “She has to do her homework .”
