1. He finished the report in 5 days.

Question

2. He finished the report for 5 days.
3. He finished the report during the 5 days.
[Can we use all the sentences? What is the difference in meaning when we use 'for' as in #2? ]

4. He read the book in 5 days.
5. He read the book for 5 days.
6. He read the book during the 5 days.
[Can we use all the sentences? What is the difference in meaning when we use 'for' as in #5? ]

Answer 1

1, 3, 4, and 6 are all correct.

2 and 5 are incorrect.