So / Neither Agreement Quiz
10 multiple-choice questions on "So do I" and "Neither do I" — agreeing with positive and negative statements using subject-auxiliary inversion.
This quiz checks how confidently you can apply So / Neither agreement at B1-B2 level, with questions built around real auxiliary choices — do, does, am, have, can, will — rather than abstract rule statements. Each question presents a short exchange, so you have to judge which auxiliary and which starter word ("So" or "Neither") fit the original statement correctly. Read the full So Do I / Neither Do I grammar guide first if you need a refresher.
If a question catches you out, the FAQ section below explains the underlying rule in more detail, including common mistakes learners make with this point, such as forgetting the inversion or creating a double negative with "Neither don't I." Reviewing the explanation immediately after an incorrect answer, then retrying the quiz on a different day, builds more durable grammar knowledge than repeating the same 10 questions back to back.
So / Neither Agreement — FAQ
What is the rule for "So do I"?
"So do I" is used to agree with a positive statement someone else has made. The pattern is "So + auxiliary + subject," where the auxiliary must match the tense and form of the verb in the original sentence. If the original sentence has no auxiliary (present simple or past simple main verb), you insert "do," "does" or "did": "I like jazz." "So do I."
What is the rule for "Neither do I"?
"Neither do I" is used to agree with a negative statement. The pattern is "Neither/Nor + auxiliary + subject," with the auxiliary matching the original sentence but kept in its positive form, since "neither" already carries the negative meaning: "I don't like olives." "Neither do I." You can also say "Nor do I" with the same meaning.
Why do "So do I" and "Neither do I" use inverted word order?
Both patterns require subject-auxiliary inversion, the same mechanism used in questions and in negative-adverbial inversion, but here it signals agreement rather than a question. The auxiliary moves in front of the subject: "So am I," "Neither have we," "So can she." Saying "Neither I do" instead of "Neither do I" is a common learner error because it skips this inversion.
How do I choose the correct auxiliary for "So" or "Neither"?
Look at the auxiliary or modal verb already in the original sentence and reuse the same one: "be" gives "so am/is/are," "have" gives "so/neither have/has," modals like "can" or "will" stay the same. If the original sentence is present simple or past simple with no auxiliary, insert "do," "does" or "did" depending on the subject and tense: "She works in Berlin." "So does her brother."
What is the difference between "Neither" and "Nor" in this pattern?
"Neither" and "Nor" are largely interchangeable when agreeing with a negative statement: "Neither do I" and "Nor do I" mean exactly the same thing. "Neither" is more common in everyday spoken English, while "Nor" can sound slightly more formal or literary, but both require the same auxiliary-subject inversion.
What is the difference between "So do I" and "Me too"?
"So do I" is the grammatically explicit form, built with subject-auxiliary inversion, and is appropriate in both spoken and written/formal English. "Me too" is an informal spoken shortcut with no auxiliary and no inversion, used casually among friends but generally avoided in formal writing or professional contexts.
What is the difference between "Neither do I" and "Me neither"?
"Neither do I" is the standard grammatical structure using inversion, suitable for formal and informal contexts alike. "Me neither" is its casual spoken equivalent, used to quickly agree with a negative statement in conversation, e.g. "I don't smoke." "Me neither." It is not typically used in formal writing.
Is "I think so" related to "So do I"?
No, they are different structures. "I think so" uses "so" as a pro-form replacing an entire clause after verbs like think, hope, guess or believe, with no inversion: "Is it going to rain?" "I think so." (= I think it is going to rain.) "So do I" agrees with someone else's statement about themselves and always requires auxiliary-subject inversion. The two patterns should not be confused.
Why is "Neither don't I" incorrect?
"Neither don't I" is a double negative and is ungrammatical. "Neither" already expresses the negative meaning by itself, so the auxiliary that follows it must stay in its positive form: "Neither do I," not "Neither don't I." Adding "not" or "n't" as well creates a redundant double negative that native speakers do not use.
At what level are "So do I" and "Neither do I" typically taught?
This pattern is usually introduced at B1 level as a natural extension of auxiliary verbs and short answers, then reinforced at B2 alongside other subject-auxiliary inversion structures. Learners at B1/B2 are expected to use both "So + auxiliary + subject" and "Neither/Nor + auxiliary + subject" accurately in conversation and writing.