Delhi is hotter than Jammu.
Explanation:
- The given sentence is in the negative form of positive degree: “Jammu is not so hot as Delhi.”
- To change into comparative degree, we compare Delhi with Jammu.
- The adjective “hot” changes into “hotter” for the comparative degree.
- Thus, the sentence becomes: “Delhi is hotter than Jammu.”
By whom can it be done?
Explanation:
- The given sentence is an interrogative in active voice: “Who can do it?”
- In passive voice, the object “it” becomes the subject.
- The verb phrase changes from “can do” to “can be done.”
- The subject “who” changes to “by whom.”
- Thus, the passive sentence is: “By whom can it be done?”