Wyjaśnij różnicę w znaczeniu między parami zdań.
1a) You know I could have covered that distance in thirty minutes but I didn't feel like.
1b) You know I could cover that distance in thirty minutes when I was younger.
2a) Frank, you could easily have fixed it, I suppose.
2b) Frank, you could have fixed it! Now we need to get another one!
3a) Pete just can't have done it.
3b) Pete just couldn't do it.