Englishfor English speakers
a torto e a direito
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.
e
Noun
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E is the fifth letter of the alphabet, and is the most common vowel and letter used in the English language.
"d" comes before "e"
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The constant e is a real number that has formula math \mathrm{e}=\lim_{n \to \infty}\left(1+\frac{1}{n}\right)^{n}/math, and is approximately 2.718281828.