How do you say these sentences in spanish in past tense.

The dog took the letters to the mailbox.

The dog is driving to the mailbox.
The dog is reading the letter.

You ask for the past tense and the first one is fine. BUT "is driving" and/or "is reading" is NOT the past tense but either the Present Indicative or the Present Progressive tense!

1. El perro tomó (llevó) las cartas al buzón.

2. El perro conduce/maneja (está conduciendo/manejando al buzón.

3. El perro lee/está leyendo la carta.

Sra

To say these sentences in past tense in Spanish, you would need to use the preterite tense. Here are the translations:

1. The dog took the letters to the mailbox.
El perro llevó las cartas al buzón.

2. The dog is driving to the mailbox.
El perro conducía al buzón.

3. The dog is reading the letter.
El perro estaba leyendo la carta.

To say these sentences in past tense in Spanish, you will need to use the preterite tense. Here is how you can do it:

1. The dog took the letters to the mailbox.
In Spanish: El perro llevó las cartas al buzón.
Explanation: To put this sentence in the past tense, you need to conjugate the verb "llevar" (to take) in the preterite tense. "Llevar" becomes "llevó" to match the singular third-person form of "el perro." Also, "las cartas" means "the letters," and "al buzón" means "to the mailbox."

2. The dog is driving to the mailbox.
In Spanish: El perro estaba conduciendo hacia el buzón.
Explanation: To place this sentence in the past tense, you use the imperfect tense of the verb "estar" (to be) combined with the gerund form of "conducir" (to drive). "Estaba conduciendo" translates to "was driving." "Hacia el buzón" means "to the mailbox."

3. The dog is reading the letter.
In Spanish: El perro estaba leyendo la carta.
Explanation: To convert this sentence into the past tense, you use the imperfect tense of "estar" (to be) combined with the gerund form of "leer" (to read). "Estaba leyendo" means "was reading." "La carta" means "the letter."