«his old jacket can) defend him from the rain or the wind.» почему здесь надо написать "could not"? я думала, что "didnt can".

Тут нчего не понятно где это слово написано?

A tiger is a beautiful wild animal that has an incredible strength and sustaining power. Being one of the cleverest animals on the Earth a tiger enjoys a native cunning, phenomenal intuition and excellent observation.Handsomeness and gracefulness of this wonderful beast dazzles not only a man but also animals. Black stripes at tiger’s back are looked perfectly on orange background, but stripes’ drawing doesn’t ever repeat among predators.A tiger’s glance hypnotizes, and its amber yellow, round eyes can distinguish a slight movement making it invulnerable. Rampant and dense whiskers give the animal courage and nobleness, and straw colored, sharp tusks or claws don’t give any chance to a prey.

1. Yes, she is the most interesting person I have ever met. 
2. Yes, its the longest book I have ever read. 
3. Yes, its the best opera I have ever heard.
4. Yes its the most difficult article I have translated.
5. Yes, its the funniest film I have ever seen. 
6. Yes, Uncle Jack its the kindest man I have ever known.
7. Yes, its the most exciting trip I have ever had.
8. Yes, its the most expensivest record I have ever bought.
9. Yes, Mary is the tallest girl I have ever met.
10. Yes, its the hardest test I have ever done.