Convert the following positive sentence into comparative sentence :
This knife is not as sharp as that one.

Question

Convert the following positive sentence into comparative sentence : 
This knife is not as sharp as that one.

Accepted Answer

Option 1, "This knife is sharper than that one," is the correct comparative sentence for the given positive sentence, "This knife is not as sharp as that one." Here's why:

1. **Explanation for Option 1:**
   - The original sentence, "This knife is not as sharp as that one," implies that "that one" is sharper than "this knife." To convert this into a comparative sentence, we need to directly compare the sharpness of the two knives, indicating that "that one" is sharper. Option 1 achieves this by stating, "This knife is sharper than that one," which correctly reflects the intended comparison by using the comparative form "sharper."

2. **Why Other Options are Incorrect:**
   - **Option 2: "This knife is sharper."**
     - This sentence is incomplete for a comparative context because it does not specify what "this knife" is being compared to. It lacks the necessary comparison to "that one," making it an incorrect transformation of the original sentence.
   
   - **Option 3: "That knife is sharpest of all."**
     - This sentence uses the superlative form "sharpest," which is not appropriate for a direct comparison between two items. The original sentence only involves two knives, so a comparative form is needed, not a superlative. Additionally, "of all" introduces a broader comparison that is not present in the original sentence.
   
   - **Option 4: "This knife is more sharper than that one."**
     - This sentence is grammatically incorrect because "more sharper" is an incorrect comparative form. The correct comparative form is simply "sharper," as used in Option 1. The use of "more" with "sharper" is redundant and incorrect.

In conclusion, Option 1 is the correct choice because it accurately and grammatically transforms the original sentence into a comparative form, maintaining the intended meaning and comparison between the two knives.