Please hurry up because we don't have time.

He is good at saving money.

This plan is like killing two birds with one stone, it can save both time and money.

We started cooking for ourselves to save money.

We should refrain from using electricity to economize on energy.

We made a new plan.

We are planning a picnic for next week.

He is an expert in tidology, studying the fluctuations of the sea's tides.

Have you checked the timetable for the new semester?

I exercise at the gym for two hours every day.