Englishfor English speakers
one
Determinative
—
(ordinal first) The number 1.
We have one nose and one mouth.
one
Noun
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The number 1.
One is the smallest whole number.
one
Pronoun
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One is a singular pronoun which means "someone" or "people". It is used more often in formal writing.
It is easy to see the difference if one looks closely enough.
and
Conjunction
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You use and to talk about two things at once.
I like singing and reading.
Mary and Jane went on a holiday together.
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You use and when you are listing a few things and you are now on your last item of the list.
I like singing, reading, cycling and playing soccer.
I used to like this girl from my class as she is pretty, gentle and caring.
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And is used when you are putting two sentences together.
She came into the store, shouted at the cashier, and left.
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Used to show what happened after something else.
The alarm went off and I woke up.
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And is used to join certain numbers together.
Two hundred and thirty-five people went missing after the earthquake.
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.
half
Noun
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A half is 1/2 of a whole; 50%.
Sales were down from January to June but jumped in the second half of the year.
Half a year later, the baby was born.
A half minute after the game started, the rain began.
It took us an hour and a half to get the bike working again.
The city was about half the size of Vancouver.
More than half the money came from the government.
It's cost us three and a half thousand dollars.
We'll meet at half past two.
It's two and a half times as big as the old one.
The coach changed the goal keeper at half time.
The same car might cost about half as much again as in Britain.
These cookies are not half as good as the ones your mum makes.
The apples are half price today.
When I phoned, he was still half asleep.
The glass was half full.
Since the early 1980s the army's strength and budget have been cut in half .
The car was half on the road when it was hit.
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A half is one part of a game that is divided into two parts.
At the end of the first half, Japan is leading Iran by two points.
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A half is one end of a sports field.
He kicked the ball deep into New England's half.
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A half is a player who plays in the middle part of the field in sports like football, rugby, etc.
times
Preposition
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multiplied by
"Three times two is nine" is written: 3 × 2 = 9.