She will be a teacher или she will a teacher

She will be a teacher - она будет учителем

Active voice:   present simple – i play tennis every day  present continuous – i am playing tennis now  present perfect – i have never played tennis.  present perfect continuous – i have been playing tennis since early morning  past simple – i played tennis yesterday  past continuous – i was playing tennis at 5 o’clock yesterday  past perfect – поскольку надо показать завершённость действия – i had finished playing tennis by 5 o’clock yesterday  past perfect continuous – i had been playing tennis for 2 hours when they came  future simple – i will play tennis tomorrow  future continuous – i will be playing tennis at 5 o’clock tomorrow  future perfect – опять же нужна завершённость – i will have finished playing tennis by 5 o’clock tomorrow  future perfect continuous – i will have been playing tennis for 2 hours by 4am