Explain how stem-changing -ir verbs are different from stem-changing -ar and -er verbs in the present subjunctive.
for unit 8 lesson 6: ¡buen viaje! unit test.

So, if you are using the verbs -ar and -er,

example: Correr, Run. Saltar, to jump.

most of the time, you are talking on your present tense.

If you use an -ir verb, you are talking in the future tense.

example: Abrir, to open. dormir, to sleep.

those are sentences that you're going to use, talking about the future. something you wan to do later, or next.

Explanation:

So, the difference is that -ir is for the future tense

and that -ar -er are for the present, tense.