Выписать из этого абзаца предложение с модальными глаголами или их заменителями эквивалентами и поставить каждое из этих предложении поставить в трех временах (Present, Past, Future Indefinite)

His wife Anna Petrovna could not work at the plant or at an office because they had three children. She had look after them. But now her daughter and her sons are grown up. The sons Boris and Igor have their own families and live in their own flats.

предложение с модальным глаголом : His wife Anna Petrovna could not work at the plant or at an office because they had three children.

В форме Past оно уже стоит

Форма Present His wife Anna Petrovna can not work at the plant or at an office because they have three children. (had меняется на have потому, что Present не согласуется с Past)

Форма Future : His wife Anna Petrovna will not be able to work at the plant or at an office because they have three children. (tp be able to - заменитель can в будущем времени)