Question

In which place a,an,the is use in any sentence

Answer 1

a - before consonant sound
an -- before vowel sound
the - before any historic, river, natural things etc...
hope this helps u

Answer 2

 The is used to refer to specific or particular nouns; a/an is used to modify non-specific or non-particular nouns. We call the the definite article and a/an the indefinite article.