So Do I and Neither Do I: Agree Naturally
Find common ground without repeating every word.
By the end: Reply to someone’s habits and experiences using the right auxiliary, and make it clear when your situation is different.
Tutor guide: Let the learner try first. Use the short follow-up questions and ask them to explain one quiz choice. Extra discussion is optional.
The quick answer
For a shared positive statement, use so + auxiliary + subject: “I cycle to work.” “So do I.” For a shared negative statement, use neither + auxiliary + subject: “I don’t drive.” “Neither do I.” Both replies mean that the same thing is true for the second person.
You are getting to know a new classmate. A short reply can show a connection, but choosing the wrong verb or a negative reply can change what you mean. Practise the replies, then add a personal detail to keep the conversation going.
On your own: Read each explanation, answer the short speaking prompt aloud (or write if needed), then reveal the model and improve your answer. Finish with the quiz and final task.
The extra-detail panels are optional. Keep the main route to about 15 minutes; take longer if the discussion is useful.
1. Shared positive or shared negative?
A shared positive
“I enjoy walking.”
“So do I. I walk by the river.”
The second person enjoys walking too. In everyday conversation, Me too is also natural.
A shared negative
“I don’t enjoy crowded shops.”
“Neither do I. I shop early.”
The second person also dislikes crowded shops. Me neither is a natural conversational alternative.
Keep the order: so/neither → auxiliary → subject. An auxiliary is a helping verb such as do, have or can. After neither, the verb is positive: Neither do I, not Neither don’t I.
Look at the grammar, not just the feeling: “I hate queuing” has a positive verb form, so shared agreement is So do I. “I don’t like queuing” has a negative form, so use Neither do I.
2. Match the verb and the person
| Meaning | Pattern | Example |
|---|---|---|
| A present state | be → am/is/are | “I’m ready.” “So am I.” |
| A present habit | present simple → do/does | “I work locally.” “So do I.” |
| A past action | past simple → did | “I walked here.” “So did I.” |
| An experience | have/has + past participle → have/has | “I haven’t tried climbing.” “Neither have I.” |
| An ability | can → can | “I can’t skate.” “Neither can I.” |
Keep the tense or modal meaning, but make the auxiliary fit the new subject: “Maya works locally.” “So do I.” “I work locally.” “So does Maya.” With be, do not add do: say So am I.
A different word order has a different job
“So do I” adds a second person: I do the same thing. “So I do” can acknowledge something about yourself: “You have two tickets.” “So I do! I’d forgotten.” For the shared experiences in this lesson, keep the auxiliary before the subject.
3. When your situation is different
Positive statement, different reply
“I like working with music.”
“I don’t. I prefer quiet.”
Use subject + negative auxiliary to show that the positive statement is not true for you.
Negative statement, different reply
“I can’t cook.”
“I can. I make a good soup.”
Use subject + positive auxiliary when the negative statement is not true for you.
These replies describe your situation; they do not say the other person is wrong. A friendly tone and a brief explanation help. “Neither do I” agrees with a negative statement. “I do” gives a different positive answer.
Other ways to share the same experience
“I don’t drink fizzy drinks.” “I don’t either.” Here the negative is in don’t, with either at the end. “Nor do I” also means “Neither do I”. For a positive statement, “I do too” uses normal subject–verb order. These are alternatives, not corrections to the so/neither pattern.
Repair two messages
Say or write a corrected version first. Then open the explanation.
1. “I’m keen to join the club.” “So do I.”
Show the correction and reason
“So am I.”
The first statement uses am, a form of be. Match be in the reply: I am keen too.
2. “I don’t buy things on impulse.” “Neither don’t I.”
Show the correction and reason
“Neither do I.”
Neither already carries the negative meaning. Use the positive auxiliary do. Another correct reply is “I don’t either”.
Mastery quiz: eight exercises with answers
Choose one best answer for each situation. Work without the table first, then check your answers. Each choice has its own explanation.
Answer key with explanations
So do I. So do I adds a shared positive habit. Enjoy is present simple, so use do.
Neither am I. Neither am I means I am not free either. Keep am before I.
So did I. Took is past simple, so the shared positive reply uses did.
Neither have I. Neither have I matches the present perfect and adds the same negative experience.
So can I. Keep the modal can: So can I means I can use it too.
So does my sister. So adds the shared positive, and does agrees with the new singular subject my sister.
I do. I especially like spicy soup. I do gives a positive answer about your own preference, followed by a helpful detail.
So do I. Hate has a positive verb form here, even though the feeling is unpleasant. Use so + do + I.
This checks your understanding of this lesson. It does not assign an overall English level.
Use it without the model
Have a short conversation with an imaginary new classmate. Include one shared positive, one shared negative and one different preference, each with a brief detail. Use at least two different auxiliaries. Say both roles aloud or write them. If you have a partner, exchange roles.
Compare a possible response
A: I’m interested in photography. B: So am I. I take pictures of birds. A: I don’t enjoy crowded places. B: Neither do I. I prefer parks. A: I like getting up early. B: I don’t. I’m more energetic in the evening.
Self-check: Shared positive: So am I. Shared negative: Neither do I. Different preference: I don’t. The auxiliaries match the original statements. Your own topics and details can be different.
If a choice still feels uncertain, revisit the explanation and try a new example.