Question

Which statement is true about the verb estar?

A.
It is an irregular verb.

B.
Its yo form follows a regular pattern.

C.
It is a regular verb.

D.
Its yo form needs an accent mark.

Answer 1

It is Irregular:
Spanish verbs are composed of a stem and root (-ar, -er and -ir)
Some IRREGULAR VERBS change their stem in the present tense,indicative mode.
when a VERB is conjugated, and E is the last stem vowel, and it's stressed, e changes to ie