Answer:
Do you have an image of sentence 4? I can't help you if I don't know what the sentence is, but I can explain.
Step-by-step explanation:
To change something to passive voice means to turn it into past tense, for example; He is old and cranky. So you would take the word is and change it into a past tense word, such as this; He was old and cranky. This goes for active voice also except you are changing the past tense into present tense.