Rewrite the sentences using have something done 1. central heating is going to be installed in our house next month. 2. their new house is being decorated at the moment. 3. the windows will be cleaned. 4. a new pair of glasses is going to be made for him.

We are going to have central heating installed next month
They are having their new house decorated at the moment
They will have the windows cleaned
He is going to have a new pair of glasses made