1. I can't think of anybody whom to invite - I can't think of anybody to invite 2. Would u follow me wherever I go? - Would u follow me wherever I went? 3. We all have to live in the society - We all have to live in society 4. The number of the unemployed is going up - The number of unemployed is going up 5. I'm thankful for your help - I'm grateful for your help. 6. We talked about if it was ready - We talked about whether it was ready 7. Except Angie, everybody was there - Except for Angie, everybody was there 8. The train may be late, as it happened yesterday - The train may be late, as happened yesterday 9. Stefan can never return back to his country - Stefan can never go back to his country / Stefan can never return to his country 10. My cousin works for the NATO - My cousin works for NATO
Because the word 'could have' suggests ability, whereas the word 'would have' suggests possibility. This is the important difference between the two words. IMO.. :)
@vinayrajiv one suggestion from my side , don't put the answers in a single post. Put the questions first then we can give answers accordingly , then you can put OA !!!
Some questions which may be counted as common mistake if wrongly understood.
1. Veena compared his home-made wine ____toxic waste. ( to, by, with) 2.βThe teacher compared Sneh's exam______Kajal's to see whether they had cheated.β ( to, with, by )