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.
nice
Adjective
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If something is nice, it's good and people probably like it.
I didn't know him, but I hear he was a very nice man.
Thank you, sir; have a nice day yourself, sir.
It's great. It's much nicer than your old place.
Thank you for coming! It was so nice to see you again.
mess
Noun
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A mess is a dirty or untidy place or situation.
Your room is such a mess! You're not leaving the house until you clean it up!
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A mess is a number of people who eat together.
mess
Verb
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If you mess, you take meals with a mess.
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If you mess, you eat with others.