have sb do和have sb doing区别
怎么区分非谓语动词是用to do 还是doing ?答:4、在“主语+系动词+表语(形容词)+to do”结构中,不定式的主动形式表示被动意义。该结构中常用的形容词有:easy, hard, difficult, important, impossible, interesting, pleasant, nice, comfortable, safe, dangerous等。2、下列动词或词组一般+ doing consider,suggest / advise,look forward to...