Ответ:

2) had already visited

3) when he saw

4) slowly to get

5) тут к сожалению я бессилен

6) was swimming

2. He visited the Caribbean twice before.

3. He was swimming when he saw two sharks.

4. He was too slow to get away from them.

5. Luckily they stopped swimming towards him.

6. Now Lee doesn't swim far from the show.