I must to do it这句话在语法上讲对吗?

I must to do it这句话在语法上讲对吗? i found it difficult to do这句话对吗? All I have to do is learn English.这句话语法对吗? Please do not suspect that I to your love,这句话语法对吗? He is more adapt to do it than I do 这句话对吗? i can do it 语法对吗 I have no idea of how to do it.去掉of这句话对吗、 I have no idea what to do it这句话符合语法吗 what would you like something to eat这句话在语法上对吗? I have run out of food ,I must go to buy some.这句话语法上有错误吗? I can do it myself 这句话对吗 It cost sb to do sth,这句话对吗?