“1. I have to clean my apartment today.
My apartment
have has to be cleaned today.
You need to use "has" because "my apartment" is singular.2. I don't have to defrost the refrigerator until next week.
The refrigerator
doesn't have to be defrosted until next week.
You forgot to make the sentence negative.3. I wish someone had introduced me to the president at the reception.
I wish I had
been introduced to the president
at the reception.
These sentences are in the past perfect tense.4. You must develop this film before the end of the year.
This film must
be developed before the end of the year.
You forgot the word "be".
5. We often use the passive voice in textbooks.
The passive voice is often used in textbooks.
6. When I got to the party, they were already serving dinner.
When I got to the party, dinner
was already being served.
The tense is past continuous:
(active) they were serving dinner --> (passive) dinner was being served.
7. They don't speak Spanish during the meetings
Spanish
are is not spoken during the meetings.
The word "Spanish" is singular.8. Warner brothers
introduced sound to the movies in 1927.
Sound
was introduced to the movies in 1927
9.
We never use notes during an examination.
during an examination was used notes
Notes
(Try to correct this one yourself. Start with the word "Notes".)
10. If there had been time, we would have finished the job.
If there had been time, the job would have been finished.
11. I have to take my little boy to the dentist today.
My little boy
has have to be taken to the dentist today.
The word "boy" is singular.12. We're using rented equipment for the time being.
equipment was rented for the time being.Rented equipment is being used for the time being.
This sentence is tricky. Your sentence is not bad, however, the word "rented" is used as an adjective in this sentence. The main verb is "use". The passive sentence is not very good because using the word "being" twice sounds quite awkward (even though it is correct).
13. People don't speak English in that part of the world.
English is not spoken in that part of the world.
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