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.
pig
Noun
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A pig is a mammal.
On this farm, we have over 200 pigs, but no cows or horses.
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If you call someone a pig you mean that they eat too much, are not clean, or are not a nice person.
My sister is such a pig. We bought a bag of sweets and she ate them all in one day.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
poke
Verb
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To poke is the act of using one finger to touch someone else, usually to attract his/her attention.
She did not even notice me poking her.