Presents are given on Christmas Eve.
Step-by-step explanation
The object of the active voice, becomes the Subject in the passive voice.
If you can understand that sentence, you are well on your way to becoming a grammar grandmaster.
- We is the subject of the original sentence.
- Give is the verb
- presents is the object.
- This is the active voice.
We do the giving and presents is what we give. We subject presents object.
When you reverse the process, the result is flatter and less dramatic much more suited to scientific writing.
Presents are given ... is the passive voice