1. The girl was on the point of leaving when her boyfriend finally entered the café.
- be on the point of Ving: đang định làm gì
2. You are bound to have health insurance.
- be bound to V: phải làm gì
3. The books were too expensive for me to buy.
- S+ be+ too+ adj+ for O+ to V: quá... đến nỗi mà
4. Why wouldn't your sister let you see her new house?
- let sb V: để ai làm gì