Question

Little more concentration could have been fruitful for the whole process(error part)

Answer 1

Answer:

Little more concentration could be fruitfulfor the whole process.

Explanation:

Here, 'could be' should be the right answer. So, 'could have been' is the error.

USE of Could Be: When 'could be' is used, it often means a possibility of some sort. But it is used to present a context in the near future. Could is the past tense of 'can' but here it is used to present a possibility.