Mettre au singulier une phrase contenant un nom dénombrable Reformulation

Quel est le singulier de chacune des phrases suivantes ?

The books are very interesting.

The book is very interesting.

The books is very interesting.

The book are very interesting.

The book are very interestings.

These foxes are intelligent.

This foxes is intelligent.

This fox are intelligent.

These fox is intelligent.

This fox is intelligent.

I have two dogs.

I has one dog.

I have one dogs.

I have one dog.

I have two dog.

The chairs are not comfortable.

The chair is not comfortables.

The chair are not comfortable.

The chairs is not comfortable.

The chair is not comfortable.

My grandmothers are nice.

My grandmother are nice.

My grandmother is nice.

My grandmothers is nice.

My grandmothers aren't nice.

The cars are amazing.

The car is amazing.

The cars is amazing.

The car are amazing.

Car is amazing.

The students are not listening.

The student is not listening.

The students is not listening.

The student is not listenings.

Student is not listening.