I. Insert the missing form of the verb to be: 1) Sally has two brothers. They ___ students. 2) Shakira ___ a popular singer. 3) I ___ cooking dinner for my parents.

1. Sally has two brothers. They are students.
2. Shakira is a popular singer.
3. I am cooking dinner for my parents.

The verb to be agrees with the subject: they are, Shakira is, I am.