21. explain how stem-changing -ir verbs are different from stem-changing -ar and -er verbs in the present subjunctive. (4 points)

The stem-changing _ir verbs are different from stem-changing -ar and -er verbs in the present subjunctive by a reason particularly:

- The verbs in Spanish that finish in "ntir" regularly change the previous vowel for a combination "ie" in the present subjunctive.

Examples:

1. Sentir: Sienta (subjunctive form).

2. Mentir: Mienta (subjuntive form).

Explanation:

The subjunctive form has many similarities among the verbs finished in "ar", "er" or "ir", but the case in the answer is an exception.

these are the words to choose from to people answer the question:

nieta--yerno--tia--tio--primo--nuera--abuelo--cunada