Переделайте в пассивный залог: my parents built this house 20 years ago. tom will do his homework in the evening. mom is washing dishes now. they have just discussed the problem. grandma washes the floor every day.

This house was built 20 years ago by my parents.
Homework will be done in the evening by Tom.
Dishes are being washed by mom now.
The problem have been just discussed.
The floor is washed every day by grandma. 

This house was built by my parents 20 years ago.
Tom's homework will be done in the evening.
The dishes are being washed now by Mom.
The problemh have just been discussed.
The floor is washed by Grandma every day.