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’. As the boys missed the bus, they couldn’t able to reach the school on time.

Explanation

The correct answer is option 1) i.e. 'couldn’t . ' Key Points The error lies in Part (couldn’t able to )of the sentence. As per instructions, the remaining portion of the sentence is correct. The given sentence is conditional because the boys missed the bus hence it is evident they couldn't reach the school on time. Here 'could'nt' is already negative in the tone which is why 'able to' is redundant. So we will not use 'able to' after 'could'nt' Therefore, the use of 'couldn’t able to 'in the sentence should be replaced with ' couldn’t 'to make it grammatically correct . Therefore, the correct answer is Option 1. Correct sentence:As the boys missed the bus, theycouldn’t reach the school on time.