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.
screw
Noun
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A screw is a small metal thing for holding pieces of wood together. You turn it to move it in or out of the wood.
I need some screws to hold the shelf to the wall.
screw
Verb
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If you screw in a screw, you put it into a piece of wood by turning it.
I screwed the hinge into the door.
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If you say, "screw this", you decide not to do it because you are frustrated.
Screw this, I will just sit here and do nothing all day.
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If you are screwed, you are in trouble.
The teacher caught me when I tried to sneak out of the door. I am screwed.
loose
Adjective
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If something is loose, it moves easily or may come away from what it is attached to.
His tooth is loose and will probably come out in a day or two.
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If something is loose, it does not fit closely.
My pants are so loose that they keep falling down.