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.
heart
Noun
—
The part of the body that pumps blood.
He has a problem with his heart.
—
(symbolic) Where emotions are.
You broke my heart.
—
Center, core.
We get to the heart of the problem.
—
for others, compassion.
He has a lot of heart.
in
Preposition
—
Used to show that something is inside something else.
The cat is in the box.
—
Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
—
Used to show movement towards the inside.
The rain came in through the window.
winter
Noun
—
Winter is the coldest season of the year. In northern countries, December, January and February are winter months.