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一、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：① 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. ② She is my mother.( 变成一般疑问句) -----Is she your mother? Yes, she is. No, she isn’t.③ This is a book.( 变成一般疑问句)------Is this a book? Yes, it is. No, it isn’t.④ These are strawberries.( 变成一般疑问句)----Are these strawberries? Yes, they are. No, they aren’t.⑤ There is some chicken on the table.( 变成一般疑问句)-----Is there any chicken on the table? Yes, there is. No, there isn’t.(2)如果是第二类，即含有行为动词的句子（如like，have，play，eat，run，need等）时，要分两步看主语。①I / We / You / They 时，要借助于助动词do的帮助来变成一般疑问句。即句型为： Do + 主语 + 动词原形 + 其他？否定句只在动词原形前加don’t。例如：①②③④ I have some tomatoes in my backpack.(否定句)I don’t have any tomatoes in my backpack. ( 变成一般疑问句)-----Do you have any tomatoes in your backpack?Yes, I do. No, I don’t.
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