Correct answer is ❓ “Someone is at the door.” The word “someone” is an indefinite pronoun. Even though it refers to an unknown person, it is treated as a singular subject in English grammar. Because of this, it takes a singular verb. That is why we use “is” instead of “are.” ✔ Structure: Someone + singular verb ✔ Examples: • Someone is calling you. • Someone has taken my pen. • Someone was waiting outside. In this sentence: “someone” refers to one unknown person, so the correct helping verb is “is.” ❌ Incorrect options: A) are → plural verb, not correct with “someone” C) were → past tense plural verb D) be → base form, grammatically incorrect here Important grammar point: Indefinite pronouns such as: • someone • somebody • everyone • everybody • anyone • nobody usually take singular verbs. More examples: • Everybody is excited. • Nobody was absent. • Anyone is welcome here. • Somebody has opened the window. This rule is very important in spoken English, grammar tests, school exams, and daily communication. Understanding subject and verb agreement helps learners speak and write correct English with confidence. Practice more: • Someone is knocking at the door. • Everybody is enjoying the party. • Nobody knows the answer. Keep practicing English grammar daily to improve fluency, accuracy, and communication skills. #EnglishGrammar #LearnEnglish #GrammarQuiz #SubjectVerbAgreement #SpokenEnglish @BBC Learning English @Khabane lame @Mr Bean @TikTok Creative Experts @TIKTOK MASHUP 2026 @MrBeast @TikTok Indonesia @For You House ⍟ - @englishplanet786