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حلي للمناقشة الثالثة ..

a - an - the
Called identifiers and indefinite article
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a
Come before the single name (and put before the names that begin with a consonant)

a boy - a girl - a egg - a teacher
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an
Put before the names that begin with a mobile
And vowels (reason) {a - e-i - o - u}

an egg - an English - an engineer
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a - an
Comes before the individual names of the few ..
Before the function or group of people or nationality ..
a with the figures, which means "all" such as a day
We do not use a - an intangible with the names and the names of metals and by combining the names of others or a few ..

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the
Used as a tool to identify
is used as definite articles

Comes before the name that none of its kind and only one, such as:
The river Nile
And also come before the names of rivers and the sea ... Etc. and the name by which the effect of inter
And the names of musical instruments and the names of countries and with some of the expressions on the time function with dates
Yet some expressions of public and also used with the name you mentioned for the second time

Do not use this tool with
Names of subjects and not by the specific names, such as school, home, work, bed ...
Nor with the specific names, such as days and months