Englishfor English speakers
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
stranger
Noun
—
A stranger is a person you don't know.
Children should never talk to strangers.
—
A stranger is an outsider, foreigner or newcomer.
among
Preposition
—
In or into. We say "between" 2 other things, but among 3 or more other things.
She was among her friends.
—
With a share for each.
Divide the candy among yourselves.
—
By all or with the whole.
us
Pronoun
—
You use us to talk or write about yourself and other people together with you.
She said hello to us.
Can you tell us where it is?
We think this is important for all of us.
us
Determiner
—
You use us to show which people you mean: yourself and other people together with you.
It's OK for you guys, but it's different for us women.