✔ Correct Answer: A. He is so weak that he cannot walk.

The correct answer to the question “Select the correct transformation: He is so weak that he cannot walk., He is so weak that he can walk., He is very weak to walk., He is weak enough to walk.” is He is so weak that he cannot walk.. This question belongs to Grammar Concepts & Terms in English. Practice the related questions below to master this topic for your FPSC, PPSC and NTS tests.