So/neither do I and I think so

A So and neither

Vicky: I'm hungry.

Rachel: So am I. I haven't eaten anything all day.

Daniel: Neither have I. I didn't have time for breakfast.

We use so after a positive statement and neither after a negative one.

I'm hungry. ~ So am I. (And I'm hungry./I'm hungry, too.)

I haven't eaten. ~ Neither have I. (And I haven't eaten./I haven't eaten either.)

The structure is so/neither + an auxiliary + the subject.

The auxiliary is a form of be or have or a modal verb, e.g. can.

We're really busy at work. ~ So are we.

Tom has gone to the match. ~ And so has Nick.

David can't drive, and neither can Melanie.

The subject comes at the end. NOT We're busy. ~ So we are.

In the present simple and past simple we use a form of do.

I love old cowboy films. ~ So do I.

This phone doesn't work. ~ Neither does this one.

United won, and so did Rangers.

We can use nor instead of neither.

Emma isn't here tonight. Neither/Nor is Matthew

Vicky: It's 'Round the Corner' at half past seven, my favourite soap opera. Are we going to be back in time?

Daniel: I think so. We haven't got far to go now.

Rachel: We might miss the beginning.

Vicky: Oh, I hope not. I want to know if Bernard really did steal the money.

Here I think so means I think we'll be back in time', and I hope not means I hope we don't miss the beginning'.

We can use so after be afraid, believe, expect, guess, hope, suppose and think.

Do you think you'll get the job? ~ Well, I hope so.

Are you going on holiday this year? ~ Yes, I expect so.

I don't know for sure if Henry is rich, but I should think so.

But we cannot use so after know or be sure.

There's been an accident. ~ Yes, I know. NOT I know-so.

Are you sure you're doing the right thing? ~ Yes, I'm sure. NOT I'm sure so.

There are two negative structures

NEGATIVE + SO

Is it raining? ~ I don't think so.

Are you going to the concert? ~ I don't expect so.

With expect and think, we normally use the negative and so.

POSITIVE + NOT

Is it raining? ~ I hope not.

Have we won a prize? ~ I'm afraid not.

With be afraid, guess and hope, we use the positive and not.

We can use believe and suppose in either structure.

Will there be any seats left? ~ I don't suppose so. OR I suppose not.