We make the passive by using the verb ‘be’ and adding a past participle.
For example, here’s a normal, active sentence with an object.
• James cleans the kitchen.
This is the present simple tense. The main verb is ‘cleans’. The subject is ‘James’ and the object is ‘the kitchen’. To make the passive, we move the object to the front.
• The kitchen
Then we make the tense we need using the verb ‘be’. In this case, it’s the present simple.
• The kitchen is
Then we add the past participle of the main verb. In this case, the main verb is ‘clean’.
• The kitchen is cleaned
If we want, we can add the person who does the cleaning (or whatever the main verb is) using ‘by’.• The kitchen is cleaned by James.