- I can't
**solve**this problem. - How did you
**solve**the problem? - No one could
**solve**the puzzle. - There are many problems to
**solve**. - She expected him to
**solve**the problem. - I found it difficult to
**solve**the problem. - I can't figure out how to
**solve**the puzzle. - I can't figure out how to
**solve**this problem. - She explained to him how to
**solve**the puzzle. - I know how to
**solve**the problem, but I've been asked not to tell you.