七年级上册知识点总结一般现在时一般疑问句和否定句的变法先将句子分成三类:1)含有am, is, are 的句子。 2)含有行为动词的句子,(如like,have,play,eat,run,need) 3)含有情态动词的句子,如can。 (1) 如果是第一类,即含有am, is, are 的句子。只将把am, is, are 调到句首。I am 和We are 要变成are you,some变成any,my变成your,句末用问号。否定句只在be后加not。如am---am not; is ---isn’t; are----aren’t。如: I am a boy. (否定句)----- I am not a boy. (变成一般疑问句) -----Are you a boy? Yes, I am. No, I’m not. She is my mother.( 变成一般疑问句) -----Is she your mother? Yes, she is. No, she isn’t.