so

To the (explicitly stated) extent.

It was so hot outside that all the plants died.

He was so good, they hired him on the spot.

To the (implied) extent.

I need a piece of cloth so long. [= this long]

We drove back to the office with some concern on my part at the prospect of so large a case. Sunning himself on the board steps, I saw for the first time Mr. Farquhar Fenelon Cooke.

Very (positive or negative clause).

I feel so much better now.

I so nearly lost my temper.

Very much.

But I so want to see the Queen when she visits our town!

Molly the dairymaid came a little way from the rickyard, and said she would pluck the pigeon that very night after work. She was always ready to do anything for us boys; and we could never quite make out why they scolded her so for an idle hussy indoors. It seemed so unjust.

Very much.

That is so not true!

Agreeing with actual facts or reality; true.

That is so.

You are responsible for this, is that not so?

In that state or manner; with that attribute. A proadjective that replaces the aforementioned adjective phrase.

"You're definitely not right about that." "I am so!" (→I am right about that).

If this separation was painful to all parties, it was most so to Martha.

Homosexual.

Is he so?

Used after a pause for thought to introduce a new topic, question or story, or a new thought or question in continuation of an existing topic.

So, let's go home.

So, what'll you have?

Used as a question to ask for further explanation of something said, often rhetorically or in a dismissive or impolite manner.

"You park your car in front of my house every morning." — "So?"

Used as a meaningless filler word to begin a response to a question.

What are you doing? / So I'm just fixing this shelf.

What time does the train leave? / So it leaves at 10 o'clock.

Be as you are; stand still; used especially to cows; also used by sailors.