题目内容：

there are a few things that can be done to solve the problem.是solve 还是solving?
还有every student +is对吧
there are many advantages to purchasing things online 为啥用to+ing

优质解答

①solve才对、其实除了一些特殊情况以to后面接动名词以外（比如：be used to doing devote oneself to doing pay attention to doing according to doing adapt to doing ）、一般情况下 to后面都...