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Emma: I really love English.
Noah wants to agree. What should he say?
  • Should he say “So do I”?
  • Should he say “So am I”?
  • Should he say “Neither do I”?
At first, all three replies may look possible. However, the correct choice depends on two important clues in Emma’s statement: whether it is positive or negative and which verb it contains.
Learn: in this unit, you will learn how to recognise these clues and form accurate responses with so and neither. Watch the video to discover how "so" and "neither" work.
 
Key Takeways:
We use “so” and “neither” to show that we agree with another person.
Agreement with a positive statement
Use: So + auxiliary verb + subject
I love sushi. So do I.
I’m really tired today. So am I.

Agreement with a negative statement
Use: Neither + auxiliary verb + subject
I don’t go to the cinema very often. Neither do I.
I’m not very well at the moment. Neither am I.
Use "neither" when the first statement contains a negative form such as "don’t" or "not". "Neither" is a negative word, like "not". For this reason, the auxiliary verb after "neither" should be affirmative.
A: “I didn’t see the film yesterday.”  B:Neither did I.” 

Choosing the Auxiliary Verb
In structures with "so" and "neither", the auxiliary verb depends on the tense and verb structure used in the first statement.
Step 1: Look for an auxiliary or modal verb. When the first statement already contains an auxiliary or modal verb, use the same one in the response. Auxiliary and modal verbs include: am, is, are, was, were, have, has, had, can, could, will, would, should and must
I am confident. — So am I.
They are working together. — So are we.
She wasn’t feeling well. — Neither was I.
Tom has completed the task. — So have I.
I can work independently. — So can I.
She won’t attend the meeting. — Neither will Anna.
Step 2: Use "do", "does" or "did" when there is no auxiliary. 
Affirmative statements in the Present Simple and Past Simple often contain only a main verb. In responses with "so" or "neither", use:
  • "do" in the Present Simple with I, you, we and they;
  • "does" in the Present Simple with he, she and it;
  • "did" in the Past Simple with all subjects.
I enjoy teamwork. — So do I.
Anna works well under pressure. — So does Mark.
Tom completed the task early. — So did Marta.
 
Negative statements in these tenses already contain "do", "does" or "did", so use the same auxiliary in the response.
I don’t enjoy noisy workplaces. — Neither do I.
Mia doesn’t like working alone. — Neither does Ben.
We didn’t understand the instructions. — Neither did they.
 
Other tense structures normally already contain an auxiliary or modal verb, so follow Step 1 and repeat that verb.
Present Perfect: I have finished the task.So have I.
Past Continuous: She was working late. — So was Tom.
Future Continuous: They will be travelling tomorrow. — So will we.
 
In a nutshell:
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Revise how we form gramatical tenses so you can use auxiliary verbs correctly:
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Atsauce:
BBC Learning English "So vs Neither - English In A Minute" on youtube.com