Question 1

Does the main verb change form in questions?

Accepted Answer

No — in present simple questions, the main verb stays in its base form (without -s). The agreement moves to the helper verb instead. Say "Does she like music?" — not "Does she likes music?" The helper verb "does" already carries the singular agreement, so the main verb remains "like." With plural subjects, use "do": "Do they like music?" In the past simple, use "did" for all subjects: "Did he go?" and "Did they go?" The main verb is always the base form after a helper verb. This is one of the most important rules for forming correct questions in English.

Question 2

Why do we use "does" with he, she, and it?

Accepted Answer

"Does" is the singular form of the helper verb "do" — it carries the same -s that would normally go on the main verb. In a statement, you say "She plays tennis" — the -s is on "plays." In a question, the -s moves to the helper verb: "Does she play tennis?" — "does" has the -s, and "play" returns to base form. Think of it as transferring the -s from the main verb to the helper verb. "Do" is the plural form used with I, you, we, and they: "Do you play tennis?" This transfer of agreement from the main verb to the helper verb also applies to negatives: "She doesn't play" instead of "She doesn't plays."

Question 3

How does subject-verb agreement work in negative sentences?

Accepted Answer

In negative present simple sentences, use "doesn't" with singular third-person subjects (he, she, it) and "don't" with all others (I, you, we, they). "He doesn't like spiders" — singular subject, "doesn't." "They don't like spiders" — plural subject, "don't." The main verb always stays in base form after "doesn't" or "don't" — never write "He doesn't likes." A very common mistake is using "don't" with singular subjects: "She don't know" should be "She doesn't know." In past simple negatives, this distinction disappears: "didn't" works with every subject.

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