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.
survivor
Noun
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A survivor is a person who is alive after a tragedy or major accident.
She was the sole survivor of the air crash.
from
Preposition
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When something is from someone, the person gave or sent it.
I got a gift from my grandmother today.
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When someone is from a place, that's where they started.
I am Chinese. I come from Hunan province.
Sorry I'm late. I just came from school.
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You use from to talk about distances between thing in space or time.
Saturn is far from earth.
School is 5km from my home.
The year 2515 is a long time from now.
Warsaw
Proper noun
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Warsaw is the capital city of Poland.