Grammar Topic 3: Speculations and Deductions

There is someone in the classroom. It _______the teacher he always gets there before students.

• can't be

• must be

• must is

I'm not sure but he ________Marley's cousin.

• must be

• can't be

• might be

Isabelle _________ 10 years old, she looks much older than that.

• can't be

• must be

• may be

I hear something outside the house. It _______my neighbor's cat, I hope it is.

• can't be

• mustn't be

• might be

Can you see that teacher over there? He _______ our new teacher.

• might be

• can´t be

• couldn't be

That teacher ________our new teacher she is 1st grade teacher.

• might be

• can't be

• must be

It _______ someone in the classroom because the lights are on.

• must be

• might be

• can't be

That girl over there (a)   Katie, I'm not sure, but I think she is.

No, they (a)   our teammates, they are working with other students.

My mom sounds odd, she (a)   upset because of my final grades, she saw them in the morning. I'm positive she is.