Incorrect : His drawing are as perfect as his instructor.
Correct : His drawings are as perfect as his instructor's.
Incorrect: The salary of a professor is higher than a secretary.
Correct: The salary of a professor is higher than than of a secretary.
Incorrect: The duties of a policeman are more dangerous than a teacher.
Correct : The duties of a policeman are more dangerous those of a teacher.
Examples of logical comparisons:
- John's car runs better than Mary's.
- The climate in Florida is as mild as that of California.
- Classes in the university are more difficult than those in the college.
- The basketball games at the university are better than those of the high school.
- Your accent is not as strong as my mother's.
- My sewing machine is better is better than Jane's.
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