Englishfor English speakers
a
Determinative
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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
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
big
Adjective
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If something is big, it is large in size; tall, wide, long, or fat.
He's bigger than me.
I would like a big glass of milk.
The tree was so big that you could see it over the top of the house.
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If something is big, it is important.
That's a big problem!
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Someone's big brother or a big sister is one who is older than the person.
I have a big brother who's stronger than you!
wheel
Noun
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A wheel is a round thing (circle) on a cart or carriage or train or other machine that moves. A cart has four wheels that touch the road and turn.
The cart needs a very smooth road because it has little wheels.
wheel
Verb
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If you wheel something somewhere, you transport it in or on a vehicle that has wheels.
The nurses wheeled her into the operating theatre.
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If something is wheeling, it is travelling in circles.
The eagle wheeled and dived towards the ground to catch its prey.