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Let’s go through each sentence one by one. We need to fill in the blank with the correct form of “to be” — that means: am, is, or are.

Remember:
- Use am only with I
- Use is with he, she, it, or singular nouns (like “my father”, “Alex”, “Dino”)
- Use are with you, we, they, or plural nouns (like “Alex and Dino”, “the other pencils”, “Eli and Rafa”)

Also, for questions, we put the verb first: “Are they...?”
For negative sentences, we add “not”: “The pupils are not...”

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1. I ______ a girl. → I am → ✔ am

2. My father ______ at work. → “My father” = he → ✔ is

3. Alex and Dino ______ my cats. → Two people/things → plural → ✔ are

4. Alex ______ in the garden. → Alex = he → ✔ is

5. Dino ______ on the floor. → Dino = he → ✔ is

6. My red pencil ______ on the floor, too. → “pencil” = it → ✔ is

7. The other pencils ______ in my pencil case. → “pencils” = plural → ✔ are

8. My mother ______ in the living room. → “mother” = she → ✔ is

9. Eli and Rafa ______ good friends. → Two people → plural → ✔ are

10. They ______ good at tennis. → “They” → ✔ are

11. ______ they in Amsterdam this week? → Question with “they” → start with “Are” → ✔ Are

12. The pupils ______ not at school today. → “pupils” = plural → use “are” + “not” → ✔ are

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Final Answer:
1. am
2. is
3. are
4. is
5. is
6. is
7. are
8. is
9. are
10. are
11. Are
12. are