It's an exercise about the first conditional. Students have to fill in and form first conditional sentences.

A boy gets a dog as a present. The dog has just three legs. At first the boy thinks he is useless, but ...

First Conditional - The Present - A Short Film by Jacob Frey

first-conditional-the-present-a-short-film-by-jacob-frey

Let's do English ESL general grammar practice. It's an exercise about the first conditional. Students have to fill in and form first conditional sentences.

First Conditional - The Present - A…: English ESL video lessons

Because he thinks dogs have to be bigger.

Because the dog has just three healthy legs.