are

1.Those young men are students.

2.Those young men are Medical School students.

3. Those young men eating lunch together now are Medical School students .

4.Those young men eating lunch together now in the cafeteria are Medical School students.

5.Those young men eating lunch together now in the cafeteria at Fu Jen Catholic University are Medical School students. 

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Am    Are2

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smell(2) smell(3) sound(1) sound(2) sound(3) perform act appear(1)
appear(2) appear(3) become(1) become(2) behave get grow(1) grow(2)
grow(3) seem(1) seem(2) seem(3) turn(1) turn(2)