`45,` You should bring an umbrella with you.

- It + to be + a good idea + (for O) + to V

-> S + should + V nguyên thể

`46,` Having developed new technologies, businesses are preparing for a future with more automation.

- Having PII ~ After + S + V -> Điều kiện chủ ngữ ở 2 vế giống nhau

`47,` Why don’t you invest more of budget in training and development?

- Why don’t you + Vbare : Tại sao bạn không làm gì?

-> Đưa ra lời đề nghị, gợi ý cho người khác.

`48,` How long have red-claw crayfish become a problem in Vietnam?

- When did + S + Vbare?

-> How long + have/has + S + PII?

`49,` In the future, we will be better looked after by a more modern medical system.

- Bị động tương lai đơn : S + will be + PII + (by O)

`50,` Many people believe that students should be allowed to use technological devices in the classroom.

- should be done sth : nên được làm gì

- be allowed to do sth : được phép làm gì