How to use the word "The"?

I. In the following sentences, I know that I should repeat "they", "they", "she", "he" and "it" instead of using "the <noun>" in the second part. But can I use 'the <noun>' if I introduce something using the verb "be" then talk about it with the second sentence directly following the first, not later on, and can the hearer understand that "the <noun>" mean "the noun I called it earlier"?
Ex:

1 This is a letter. The letter is written in spanish.
(Does "The letter" mean "the letter I called it earlier"?)

2 It is a box. The box is red. I will open the box and …
(Does "The box" mean "the box I called it earlier"?)

3 That is a thief. The thief is tied to a post by a rope.
(Does "The thief" mean "the thief I called they earlier"?)

4 They are doctors but the doctors are not kind.
(Does "The doctors" mean "the doctors I called they earlier"?)

5 They are slaves, and the slaves are mine.
(Does "The slaves" mean "the slaves I called they earlier"?)

6 She is a slave, and the slave is mine.
(Does "The slave" mean "the slave I called they earlier"?)

7 He is a doctor but the doctor is not kind.
(Does "The doctor" mean "the doctor I called they earlier"?)

II. And when I use the other verbs, not the verb "be", so are they grammatically correct and natural?
Ex:
8 I got a present. The present is a cat. I will give John the cat.
9 I bought a ball yesterday. The ball is red. When I kicked the ball, the ball flew over the fence.
10 She is biting an apple. The apple seems very rigid.

Thank you for your help!

Original Post

Hello, Kimconu,

The definite article "the" is in fact used to refer to something or somebody you mentioned before.

Most of your sentences do not sound natural because of the proximity between the first reference to the noun (with "a") and the second reference with "the," but your conception of "the" being used when referring to something or somebody that is already known is correct.

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