to后跟doing还是do如何判断?就是问如何判断to是否为介词.我问的就是这个啊……

to后跟doing还是do如何判断?就是问如何判断to是否为介词.我问的就是这个啊…… warn sb后跟to do 还是doing stand后跟to do还是doing? suggest 后跟to do还是doing 形式? love sb后跟to do 还是doing 介词后跟to do 还是doing? just后跟to do还是doing spend后跟to do还是doing refer to 后跟 do 还是 doing lead sb 后跟什么?to do 还是 do doing? finish 后跟什么 doing sth.还是to do learn 后跟什么.to 还是? 英语中afford后跟to do还是doing hear 后跟什么结构,是to do还是doing manage后跟to do还是doing以及用法 began后跟doing的形式还是to do 不定式 know后跟动词不定式还是动名词就是：know (sb) to do sth 还是 know (sb) doing sth stop……,后跟doing sth还是to do sth,to doing sth 或动词原形 why not 后跟do 还是doing?