Englishfor English speakers
inside
Preposition
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If mathx/math is or moves inside mathy/math, it is in mathy/math.
He locked his keys inside his car.
Outside was cold, but he was warm inside the house.
I put my pen inside my bag.
Let's look inside here.
Don't stand out here. Come on inside.
inside
Noun
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The inside of something is the part that you can't see or can't touch because other parts are around it.
The inside of my mouth hurts.
Outside, the building was dark and grey, but the inside was bright and beautiful.
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.
plane
Noun
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A plane is a surface that goes out in all directions indefinitely.
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A plane is a level of existence.
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A plane is a tool for smoothing wood.
plane
Verb
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If you plane, you glide or soar.
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If you plane a piece of wood, you smooth it with a plane.