Englishfor English speakers
either
Determinative
—
Any one out of two options.
I can write with either hand.
You can drink either tea or coffee.
Either it is or it isn't.
They can be used either alone or in groups.
Few people liked it; most either ignored it or hated it.
—
Each or both from two options
The room has a door at either end.
People were walking on either side of the road.
I can't find either shoe. I have lost both shoes.
I have a blue coat and a green coat. Either will keep me warm.
There will still be problems in either of the following two cases.
either
Adverb
—
After a list of two negatives (phrases with "not" in), this means "too" or "also".
I don't like him and I don't like her either.
I can't sing and I can't dance either.
I do not eat fish and I do not eat seafood either.
No other country has any real friends either.
as
Preposition
—
A word that is used to compare two things that are equal.
As you know, we need more workers.
I baked the cake as my mother used to.
The room looks just as it did when I was a child.
The speech, as he remembered it, was very powerful.
Interesting as it seems, I don't think I'll get it.
He was as big as a mountain.
—
A word that is used to show that two things happened at the same time.
Just as I went out, it started to rain.
We sleep as the world turns in darkness.
—
A word that is used to show why something happens.
As I couldn't understand French, I didn't watch the film.
as
Adverb
—
A word that is used to compare two things that are equal. (Used before adjectives)
You are younger than I am, but nearly as tall.
This is not as good as it was last time.