is this的疑问句可以肯定回答 Yes,it is. 也可以否定回答 No,it isn't. is this是系动词be(am,is,are的原形)＋主语……的一般疑问句，其回答就是可Yes/No,主语代词＋be/be not缩写，例如Is she a teacher(她是老师吗)？肯定回答Yes,she is(是).否定回答No,she isn't(不，她不是). 如果主语是you,回答时主语要变l,例如Are you a teacher?肯定回答是Yes,l am. 否定回答是No,l am not.
