Put a predicate of the following sentences in the Past and Future Simple, change the adverbial modifier of time where it is necessary. Translate the sen- tences.

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1. We must study the fundamentals of economics.2. These students may work at the computer class from 9 to 12 today.3. She can use different methods in her research work.4. The students must explain how the economic system works.5. Economists must study our everyday life.