Complete the sentences using must, can´t, could, may or might and be to draw conclusions about the present or must, can´t, could, may or might and have and past participle of the verb to draw conclusions about the past:
Carl ________________ (be) the best Soccer player yesterday.

I ________________(be) sick, I have fever and my stomach hurts.

Karla __________________ (change) her dress this morning.

The mason ________________ (build) this wall past Monday.

Peter ________________ (train) every day, he is an excellent athlete.​