Identify the part of the sentence that contains an error.
We discussed about the concept so thoroughly / on the eve of the examination / that I found it very easy to work it out.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → We discussed about the concept so thoroughly
The verb "discuss" takes a direct object. We discuss a thing. We do not "discuss about" it. So "about" must go.
Option 1: We discussed about the concept so thoroughly — Error. “discussed about” should be “discussed”.
Option 2: on the eve of the examination — No error. “On the eve of” means on the day or evening just before an event. It is the right phrase here.
Option 3: that I found it very easy to work it out — No error. “So ... that” is a correct pair. It shows the result of the thorough discussion.
Corrected: We discussed the concept so thoroughly on the eve of the examination that I found it very easy to work it out.