Explanations:In English grammar, subject-verb agreement is a fundamental principle that ensures the subject and verb in a sentence match in number and tense. This principle is particularly important when dealing with third-person singular subjects, such as "he," "she," and "it." In the given sentence, "She always _____ to turn off the lights when she leaves the house," the subject "she" is third-person singular, and the verb must reflect this by ending in -s or -es.
The sentence also requires a verb in the simple present tense, which is used to describe habitual actions or general truths. The verb "leaves" is already in the simple present tense, so the verb that fills the blank must also be in the simple present tense to maintain consistency.
Let's examine the options in detail:
Option A, "Remembering," is a gerund form of the verb "remember." Gerunds are verb forms that function as nouns and are not appropriate in this context because they do not agree with the subject "she" in number or tense. The sentence requires a verb form that agrees with the subject and maintains the simple present tense.
Option B, "Is remembering," is in the present continuous tense. The present continuous tense is used to describe actions that are happening at the moment or are temporary. It is not appropriate for describing a habitual action like remembering to turn off the lights. The sentence requires a simple present tense verb form.
Option C, "Remember," is the base form of the verb "remember." While this form is correct in some contexts, such as when used with modal verbs or in imperative sentences, it does not agree with the third-person singular subject "she." The sentence requires a verb form that ends in -s or -es to match the subject.
Option D, "Remembers," is the correct third-person singular form of the verb "remember" in the simple present tense. It agrees with the subject "she" in number and maintains the same tense as "leaves." This form is appropriate for describing a habitual action that the subject performs regularly.
Therefore, the correct answer is "remembers," as it correctly matches the subject "she" in number and maintains the simple present tense required by the context of the sentence.