both are good student

[GoodTaste]

The teacher said, "Both Mike and Jack are good student".

Is "are good student" correct? Should it be "are good students"?

 

[Rover_KE]

No. Yes.

(I'm sure you already knew that. Why waste our time asking?)

 

[teechar]

The teacher said,
"Both Mike and Jack are good student".

Is your teacher a native speaker of English?
Are you sure that's what he/she said? Is it possible that you might have misheard him/her?

Is "are good student" correct?

It's incorrect in the above, but it's possible in, for example, "Both Mike and Jack are good student representatives".

Should it be "are good students"?

See above.