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.
sick
Adjective
—
If a person, animal, or plant is sick, it has a disease and is not healthy.
I'm sorry, I'm too sick to go to work today.
If you're sick, you should go and see a doctor.
—
A way of saying something is bad. (Could mean one or both of the following.)
—
# If something is sick it makes you feel like vomiting. Usually this is not literal, but just means very bad.
—
#: Oh sick! There is dog shit all over everything.
—
# Sick can mean similar to person who is mentally ill (crazy), as an insult. This can also mean something bad that a crazy person might do.
—
#: Killing children is just plain sick.
—
#: That guy is really sick in the head.
—
You say this about something that is cool. That is, something you like or see as very good.
That song is sick!
building
Noun
—
A building consists of walls, a foundation and a roof that together close in some space.
I work in the Chrysler Building.