1. ought to call
I ought to call my mother tonight.
I ought to have called my mother yesterday.
2. have got to study
I have got to study chemistry because we have a big test tomorrow. very strong obligation Must!!!
3. be able to understand
I be am able to speak Vietnamese very well.
Your sister is able to speak Vietnamese very well.
4. used to practice - a practice in the past
Joan used to practice taekwondo when she was young.
used to - become comfortable with a situation or a place
Joan is used to living in Canada. (not a modal)
5. am going to travel
Sarah is going to travel around the world on bicycle next summer.
6. be supposed to call
Maria was supposed to call her sister, but she forgot.
Maria will is supposed to call her sister.
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