是may to do sth,还是may do sth?do not smoke too much.It（ )cance

是may to do sth,还是may do sth?do not smoke too much.It（ )cance may not able to do sth 还是 may not be able to do sth? May sb.do sth. it is too +adj to do sth 还是it is too +adv to do sth it is good not to do sth 还是 it is good to not do sth? may i do sth?回答否定用哪个?you may not还是you mustn't? why not后面是doing sth还是 to do sth let sb.do sth.该否定句是let sb.not do sth.还是let sb.not to do sth 是ask sb not to do sth 还是ask sb to not do sth why not doing sth还是why not do sth还是why not to do sth 那个语法是why not to do Sth还是why not do Sth 是tell sb.not do sth.还是tell sb.not to do sth.那么ask呢?