So and Too

The word order is key to understanding these similar words.

Both are used in compound sentences with a short following "tag" clause.
Notice the subject-verb inversion with "so":

He is going to see a movie, and so am I.
He is going to see a movie, and I am too.

My brother got a 100% on the test, and so did I.
My brother got a 100% on the

Thank you.

hientran What is the difference between "so" and "too"? I wonder it when I decide to select either "so" or "too" properly?

Or perhaps you are asking about their use in modifying nouns? For example:

"This coffee is too hot."
"This coffee is so hot."

This is what I initially thought your question was about. Perhaps you could clarify.

AlpheccaStarsSo is far too often used to begin a sentence,

I agree. This habit is SO annoying!

A year or so ago I told someone here that so generally doesn't begin a sentence. Since that time I've realized that that's not so.

Blue JaySince that time I've realized that that's not so.

It think it's fine when it has a legitimate purpose connecting one sentence to the next. What really annoys me is this kind of usage:

"What are your plans for today?"
"So I'm going to the shops, and then ... blah blah."

GPYit's fine when it has a legitimate purpose connecting one sentence to the next

Agreed. A valid use exists, but most of the "So...." sentences you meet now don't need it at all.

Thank you. I want to go into detail how to use them. For the above example, I don't know the difference from these sentences. If you can, you tell me more.