4. They can help us clean up the beach. They are certain. ->......................................
5. You could recover very quickly. I am very happy. ->..............................................
6. They did not tell us how to do it. I am disapointed. ->..............................................
4. They can help us clean up the beach. They are certain.
->.....They are certain to help us clean up the beach.................................
5. You could recover very quickly. I am very happy. ->.........I am very happy that you could recover very quickly.....................................
6. They did not tell us how to do it. I am disapointed. ->............I am disappointed that they didn't tell us how to do it..................................