So do I and neither do I

We use so do I to say that a positive sentence is also true for me, and I use neitherdo I or 'nor do I' to say that a negative sentence is also true for me:

Gerry: I hate mushrooms. Me: So do I (=I also hate mushrooms). Gerry: I dont live in London. Me: Neither do I / Nor do I (=I also dont live in London. For example, maybe Gerryand I both live in So Paulo).

This is often used as a reply to someone else in a conversation, but both sentencescan also be said by the same person, and even joined together: Me: My lwife loves coffee. So do I. Me: Gerry doesnt play the piano and neither do I / nor do I.

In the examples above, we use do because the first sentence is in the presentsimple tense. The verb after so or neither changes depending on the tense ofthe verb in the first sentence. (This is very similar to tag questions).

Present simple:use do / does

Gerry likes coffee. So do I.Gerry doesnt like coffee. Neither do I.

Present simple with be:use am / is / are

Marco's at the office. So am I.Marcos isnt at the office. Neither am I /Nor am I.

Present continuous:use am / is / are

Cidemar's going out tonight. So am I.Cidemar isnt going out tonight. Neither am I /Nor am I.

Past Simple:use did

Gerry went to the cinema yesterday. So did I.Gerryl didnt go to the cinema yesterday. Neither did I.

Past simple with be:use was / were

She was at the library. So was I.She wasnt at the library. Neither was I /Nor was I.

Present perfect:use have / has

Theyve been to Brazil. So have I.They havent been to Brazil. Neither have I / Nor have I.

Future simple:use will

Gerry will be at the cafe later. So will I.Gerry wont be at the cafe later. Neither will I / Nor will I.

Modal verbs:repeat the modal verb

He would like a cup of coffee. So would I.He wouldnt like a cup of coffee. Neither would I.Cidemar can speak Russian. So can I.Cidemar cant speak Russian. Neither can I / Nor can I.

Me too and me neither:We can also use me too and me neither. Me too has the same meaning as so +auxiliary verb + I and me neither has the same meaning as neither + auxiliary verb+ I. Me too and me neither are very informal.

Gerry: I hate mushrooms. Me: Me too (=I also hate mushrooms). Gerry: I dont live in London. Me: Me neither (=I also dont live in London).

Subjects other than I:Of course, we can also use these expressions to talk about whats true for other people,not just ourselves: Gerry: I hate mushrooms. Me: So does Marcos / Marcos does too / Marcos too. Gerry: I dont live in London. Me: Neither does Marcos / Nor does Marcos / Marcos neither.

Some more examples:

We live in So Paulo and so do they.I love football. Cidemar and Marcos do too.My parents dont come here often. Neither does Cidemar.She isnt French and neither is he.You dont like cold weather. Neither do we.