Question : Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution required'.
A law cannot be enforced until the President gives his assent to it.
Option 1: No substitution required
Option 2: unless the President
Option 3: however the President
Option 4: otherwise the President
Correct Answer: unless the President
Solution : The correct choice is the second option .
Until is used for time, and the subordinating conjunction unless (if not) introduces the condition in the sentence.
For example, Ram will not pass unless he works hard.
Therefore, the revised sentence would be: "A law cannot be enforced unless the President gives his assent to it."