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.
restriction
Noun
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A restriction is something that restricts or limits something else.
The restrictions on parking in the city during snowstorms make it almost impossible to find parking anywhere.
Because one student had bad food allergies, the school put a restriction on what kinds of food the other students were allowed to bring for lunch.
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A restriction is a rule or limit that tells you what you cannot do.
On his first day at work, Kwame's new boss said: "Let me tell you about our restrictions. No wearing jeans. No taking breaks. No sitting down at work. Oh, and you are not allowed to take any days off for the next six months. Welcome."