In this sentence:
… Richard wrote his book very enthusiastically and elaborately, and thus it was more popular.
What should replace the ellipsis?
- Unlike those of his colleagues
- Unlike books of his colleagues
- Not like his colleagues
- Comparing his colleagues
- Unlike his colleagues
I know option 5 is the correct answer. Why are options 3 and 4 incorrect? What is the correct structure to use for Not like and Comparing?