4、what to do后不需要跟宾语how to do后必须跟宾语【拓展】“疑问词+动词不定式”结构:know,tell,wonder,ask,findout, learn+what,which,when,where,how +动词不定式(to do)3.I oftenmake mistakes ingrammar.(1) make mistakes 犯错make mistakes in在某方面犯错(2) mistake…for… 把…误认为…例:IoftenmistakeLilyforLucy.(3) by mistake错误地例