Introduction / Context:
The sentence tests redundancy in modal expressions of ability. “Can/cannot” already expresses ability; adding “be able” repeats the meaning and creates an ungrammatical stack in standard English. Choose either “cannot” or “will not be able to”, depending on intended nuance and time reference.
Given Data / Assumptions:
- Current general statement about feasibility.
- Modal used: “cannot”.
- Phrase added: “be able”, causing redundancy.
Concept / Approach:
- Correct forms: “cannot finish …” (present general) or “will not be able to finish …” (future ability).
- Incorrect: “cannot be able to …”.
Step-by-Step Solution:
Remove the extra ability marker “be able”.Correct version: “Mangesh cannot finish this work unless he takes the help of his colleagues.”Alternatively (future plan): “Mangesh will not be able to finish … unless …”.
Verification / Alternative check:
Substitute “able” alone: “is not able to finish” works; adding “cannot” duplicates it.
Why Other Options Are Wrong:
B–D are fine once the modal redundancy is fixed.E is not applicable because A has a clear error.
Common Pitfalls:
Combining “can/could” with “be able” unnecessarily.
Final Answer:
Mangesh cannot be able
Discussion & Comments