Exercise 15: sum (all tenses)
Look back to Exercise 11 for SUBJECT COMPLEMENTS.
NOTES: For the perfect, future-perfect and pluperfect the verb sum, esse (to be) uses the perfect stock ‘fu-’:
fui, fuisti, fuit, fuimus, fuistis, fuerunt (perfect)
fuero, -eris, -erit, -erimus, -eritis, -erint (future-perfect)
fueram, -eras, -erat, -eramus, -eratis, -erant (pluperfect)