1. Structure
1.1. Affirmative
1.1.1. I/you/we/ they work for Facebook.
1.1.2. He/ she/ it workS perfectly fine.
1.2. Negative
1.2.1. I/you/we/ they DON'T WORK for Facebook.
1.2.2. He/ she/ it DOESN'T WORK fine.
1.3. Questions
1.3.1. DO I/you/ we/ they WORK for Facebook?
1.3.2. DOES he/she/ it WORK fine?
2. TO BE
2.1. Usage
2.1.1. Name
2.1.1.1. I'm John.
2.1.2. Nationality
2.1.2.1. You are Italian.
2.1.3. Job
2.1.3.1. He is a manager.
2.1.4. Feelings
2.1.4.1. We are happy.
2.1.5. Marital status
2.1.5.1. They are married.
2.1.6. Location
2.1.6.1. She is in London.
2.1.6.2. He is at work.
2.1.6.3. It is at home.
2.2. Structure
2.2.1. Affirmative
2.2.1.1. I AM
2.2.1.2. You/we/they ARE
2.2.1.3. He/she/it IS
2.2.2. Negative
2.2.2.1. I AM NOT
2.2.2.2. You/we/they ARE NOT
2.2.2.3. He/she/it IS NOT
2.2.3. Questions
2.2.3.1. Am I?
2.2.3.2. ARE you/we/they?
2.2.3.3. IS he/she/it?
3. Usage
3.1. Habits
3.1.1. I have a coffee and a sandwich for breakfast.
3.2. Routine
3.2.1. We have business meetings on Tuesdays.
3.3. Fact
3.3.1. The water boils at 100 C.
3.4. Schedule
3.4.1. The film starts at 18.40