1. decide if the following sentence is grammatically correct or incorrect.
su mamá dice, "hola".
a) correct
b) incorrect
2. choose the correct present tense conjugation of the verb tener for the following subject pronoun.
vosotros
a) tengo
b) tienen
c) tenemos
d) tenéis
3. choose the sentence that is grammatically incorrect.
a) ella hace la tarea.
b) tú haces la tarea.
c) yo hago la tarea.
d) haco la tarea.

This sentence is correct. The word su is the possessive adjective that matches the third person singular. Possessive adjectives are used to indicate ownership or possession. On the other hand, mamá is a noun that means mom. Finally, hola means hello. Finally:

Su mamá dice, "hola" means his (or her) mom says, "hello"

Tenéis is the conjugation of the verb tener for the second person plural in informal form, which is vosotros. This subject pronoun is more common to be used in Spain. In other countries, it's more common to use ustedes both in formal and informal way. Finally:

Vosotros tenéis

This sentence is incorrect because the word haco doesn't exist in Spanish. The correct sentence is hago la tarea that is equivalent to yo hago la tarea because in Spanish it's common not to include the subject pronoun in a sentence if the conjugation of the verb is correctly formed.