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.
killer
Noun
—
Someone who kills. Usually this mean someone who kills other people, and does not have a good reason to kill.
The police caught the killer today.
She was happy that her brother's killer was caught.
—
Something that kills.
Lighting can be a real killer.
—
Something that cause problems.
Failing the exam was a real killer.
—
Something that is very exciting.
The show was great, a real killer.
killer
Adjective
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If something is killer it kills.
Watch out! There are killer bees!
The family barely got away from the killer storm.
—
If something is killer it is very good.
That was a killer show!
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.