1. PROBABILITY
1.1. WEAK PROBABILITY
1.1.1. MIGHT
1.1.1.1. He might continue his studies. His father lost his job.
1.2. PROBABILITY 50%
1.2.1. MAY
1.2.1.1. They may organize the Christmas pasrty. Their parents like parties and know us.
2. REQUEST
2.1. POLITE REQUEST
2.1.1. May I come in?
2.2. COULD
2.2.1. Could you open the windows, please?
2.2.2. ABILITY PAST
2.2.2.1. She could swim faster.
3. MUST
3.1. DEDUCTION
3.1.1. They must be doing their homework at Karen's.
3.2. PERSONAL OBLIGATION
3.2.1. I must learn English this year to get an scholarship.
4. HAVE TO
4.1. EXTERNAL OBLIGATION
4.1.1. You have to go to school.
5. INFERENCE OF PROBABILTY
5.1. MIGHT
5.1.1. They might arrive on time. There is a lot of traffic.
5.2. COULD
5.2.1. She could be at school. She ususlly leaves at 2 pm.
6. CERTAINTY
6.1. CAN'T
6.1.1. She can't be at the party. She was very sick in the morning.
6.2. MUST
6.2.1. My mother must be at home.
7. ADVICE
7.1. SHOULD
7.1.1. You should take this medicine. You don´t look well today.
7.2. SHOULDN'T
7.2.1. We shouldn't hand in our project the last day.