第1个回答 2010-01-09
He is trying his best to figure out the problem
第2个回答 2010-01-09
He is trying every effort to figure out a solution to this problem.
第3个回答 2010-01-09
He is figuring out the problem
进行时的
第4个回答 2010-01-09
He is trying to find a way to solve this problem