Grammar / B1+ Grammar lessons and exercises / Auxiliary verbs: Different uses
Using Auxiliary Verbs in English
🟦Agreement: So and Neither/Nor
Use auxiliary verbs with so (for positive) and neither/nor (for negative) to agree without repeating the verb.
✅ A: “I love jazz.” → B: “So do I.”
✅ A: “I’ll try again.” → B: “So will I.”
✅ A: “Tom has finished.” → B: “So has Gina.”
✅ A: “I’m not going.” → B: “Neither am I.”
✅ A: “I can’t concentrate.” → B: “Nor can I.”
✅ A: “I didn’t like the food.” → B: “Neither did I.”
➤ If there’s no auxiliary in the original sentence, use do/does/did.
🟩Disagreement
To disagree, use: Yes/No + subject + auxiliary verb.
Match the opposite polarity of the original statement.
✅ A: “I’m not going.” → B: “I am.”
✅ A: “I didn’t like it.” → B: “I did.”
✅ A: “You will be here.” → B: “No, I won’t.”
➤ I couldn’t find the solution, but my wife could.
🟪Avoiding Repetition
Use auxiliary verbs to avoid repeating the main verb.
✅ I don’t like spas, but my wife does.
✅ Tom can play guitar, and Tina can’t.
✅ She has never faced this, but I have.
➤ No auxiliary in first clause? Use do/does/did:
“She shares your opinion, but I don’t.”
🟦Reply Questions (for Interest or Surprise)
Repeat the same auxiliary (or use do/did) to show interest.
✅ “Sarah hasn’t passed.” → “Hasn’t she?”
✅ “I won’t be there.” → “Won’t you?”
✅ “I can find the answer.” → “Can you?”
✅ “She left quietly.” → “Did she?”
🟨Emphasis with Auxiliary Verbs
Add do/does/did in present/past simple to emphasize or contradict.
✅ A: “You didn’t go.” → B: “I did go.”
✅ A: “Sally doesn’t speak Spanish.” → B: “She does speak Spanish.”
✅ A: “You don’t want to save our marriage.” → B: “I do want to.”
➤ In other tenses, stress the existing auxiliary: “I am going!”
⬛Question Tags
Use a question tag to seek confirmation. The tag is the opposite polarity of the main clause.
✅ He is from Liverpool, isn’t he?
✅ You have done this, haven’t you?
✅ Lisa went by train, didn’t she?
✅ You don’t have a car, do you?
➤ Special cases:
“I am a bad person, aren’t I?”
“Open the window, will you?”
“Let’s go, shall we?”
📌 Key Rules:
🔁 Use the same auxiliary as in the original sentence.
➕ No auxiliary? Use do/does/did.
✅ For agreement: So + aux + subject / Neither + aux + subject.
❓ Question tags: opposite polarity, same auxiliary.
❗ Emphasis in simple tenses: add do/does/did.