may i have a ruler否定回答

may i have a ruler否定回答 have i ruler may a组成一句话 may I USE your ruler 回答 do you have a ruler?sorry,i 【如何回答】 May I have some water first?(给出否定回答） May I have a Look?怎么回答 May I have a look?的回答 Is this a ruler.(做否定回答) That is a ruler .改为否定回答 I have a new ruler I have a ruler ahd an eraser.(改为否定句） May I have a hot dog?怎么回答