A. The passive of continuous tenses requires the present continuous forms of to be, which are not much used in other cases:
They are repairing the bridge.
The bridge is being repaired.
The gardener was watering the flowers.
The flowers were being watered.
Other continuous tenses are extremely rare in the passive, so the sentences such as:
They have/had been repairing the road or
They will/would be repairing the road
are not normally put into the passive.
B. After the future auxiliaries (will, be going to) and modal verbs we use passive infinitive (simple or perfect)
They will open the new hotel next year. The new hotel will be openedÖ
We are goingto paint this room. This room is going to be painted.
The government can create more jobs. More jobs can be created.
You should have told him. He should have been told.
C. Other infinitive combinations
Verbs of liking/loving/wanting/wishing etc. + object + infinitive form their passive with the passive infinitive:
He wants someone to take photos. He wants photos to be taken.
With verbs of command/request/advice/ invitation indirect object + infinitive we form the passive by using the passive form of the main verb:
He invited me to go. I was invited to go.
But with advise/beg/order/recommend/urge + indirect object + infinitive + object we can form the passive in two ways: by making the main verb passive, as above, or by advise etc. + that.....should+ passive infinitive:
He urged the Council to reduce the rates.
The Council was/were urged to reduce the rates or
He urged that the rates should be reduced.
agree/be anxious/arrange/be detemined/determine/decide/demand + infinitive + object are usually expressed in the passive by that..... should, as above:
He decided to sell the house.
He decided that the house should be sold
D. Gerund combinations are expressed in the passive by the passive gerund:
I donít like people telling me what to do.
I donít like being told what to do.
advise/insist/propose/recommend/suggest + gerund + object are usually expressed in the passive by that.....should, as above:
They insist on using credit cards. They insist that credit cards should be used.