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.
pretty
Adverb
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You use pretty before an adjective or adverb to mean "more than a little".
She was pretty sure that he'd say yes.
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You use pretty before an adjective or adverb to mean "very".
That sounds like a pretty good idea.
pretty
Adjective
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If something is pretty, people like to look at it.
Those flowers are so pretty.
I want to have a pretty painting in my house.
My girlfriend is very pretty.
penny
Noun
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A penny is a small coin of little value; 100 pennies (or 100 pence) make a pound, a dollar, a euro, etc.
This sweet only costs a penny.
If you have two pennies, you have two pence.