Модальный глагол

Помогите подчеркнуть модальный глагол или его эквивалент

can, must, may, has to

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1,2,3-мод гл 4-эквивалент

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1,2,3-мод гл 4-эквивалент

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1.can 2.must 3.may 4.has to

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you CAN see a diagram
he MUST work
you MAY find
The consumer HAS TO solve ..

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can, must, may, has to

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из них модальный глагол или его эквивалент.
1. They must solve a number of scientific problems.
2. You may use this method in your research.
3. One should know difference between these systems of marketing.
4. Firms have to increase efficiency of labour for higher profit.

из них модальный глагол или его эквивалент.
1. In this figure you can see a diagram of temperature changes.
2. He must work hard to finish the experiment.
3. You may find all the necessary material in the library.
4. The consumer has to solve the problem of choice.