How do you use the word ir in Spanish past tense?

You can't directly use "ir" in the past tense in Spanish because "ir" is an irregular verb. It's like saying "go" in English and trying to use it in the past tense without changing it to "went."

Here's how to use "ir" in the past tense:

The past tense of "ir" is "fui" for the singular and "fuimos" for the plural.

Here are some examples:

* Yo fui al cine ayer. (I went to the cinema yesterday.)

* Tú fuiste a la escuela. (You went to school.)

* Él/Ella/Usted fue a la tienda. (He/She/You went to the store.)

* Nosotros fuimos de viaje. (We went on a trip.)

* Vosotros fuisteis a la playa. (You all went to the beach.)

* Ellos/Ellas/Ustedes fueron al parque. (They/You all went to the park.)

Remember: While "ir" is an irregular verb, you conjugate the rest of the verb phrase in the past tense as usual. For example:

* Yo fui a comer. (I went to eat.)

* Tú fuiste a bailar. (You went to dance.)

I hope this helps!