notnecessary和unnecessary区别1.notnecessary和unnecessary的区别2.do和todo区别

Question

not necessary和unnecessary区别
1.not necessary和unnecessary的区别
2.do和to do区别

Answer 1

not necessary和unnecessary的区别
not necessary是否定的.
如：It is not necessary to do the work,is it?
uncessary不是否定的.]
        It is uncessary to do the work,isn't it?
  2.do和to do区别
      do是谓语动词
      to do 是不定式.
     I do my work every day.
     I want to do my work every day.
  另外,to do有时用来表明这个是动词
   如：
   to look after是个动词短语