My shoelaces came undone.
Sleeping on a problem solves it as easily as pouring oil on troubled waters.
To tell the truth, I didn't solve this question.
If you heat ice, it melts.
Ice turns back into water when it melts.
She gave me such a sincere welcome that I was at home with her immediately.
Both he and I were able to solve the math problem.
Clever as he is, he still cannot solve this math problem.
He was so clever that he could solve the problem.
We think it possible for him to solve the problem.
Since he could not work out the problem that way, he tried another way.
He succeeded in solving the question.
He is always natural with other people.
None of his students could solve the problem.
His wife's misunderstanding about him did not go away.
Can you solve the problem by yourself?
In those days, or at any rate in Cambridge, laboratory life was rather informal.
Nobody can solve this problem.
Even the teacher could not solve the problem.
The snow has melted away.