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n play basketball.
　　His mothers cousin can sing many English songs.
　　含有情态动词的句子在变一般疑问句时只须将主语和情态动词交换位置,上面两句变一般疑问句分别为
　　Can she play basketball ?
　　Can his mothers cousin sing many English songs ?
　　含有情态动词的句子在变否认句时干脆在情态动词的后边加上not ,上面两个陈述句变否认句分别为
　　She can not play basketball .
　　His mothers cousin can not sing many English songs .
　　(3)含有行为动词的句子
　　We have many friends.
　　They watch TV at 7 in the evening .
　　The students take their books to school .
　　I have lunch at school .

　　You have a sister .
　　○1
　　Do you have many friends ?
　　Do they watch TV at 7 in the evening ?
　　Do the students take their books to school ?
　　Do you have lunch at school ?
　　Do you have a sister ?
　　○2 含有行为动词的句子在变否认句时只须在行为动词前加dont .上述五个陈述句变否认句分别为
　　We dont have many friends.
　　They dont watch TV at 7 in the evening .
　　The students dont take their books to school .
　　I dont have lunch at school .
　　You dont have a sister .
　　○3 含有行为动词的句子,当主语是第三人称单数时,行为动词要加s (或es)如：
　　She has a red pen .
　　He has eggs for breakfast .
　　Her mother buys a skirt for her .
　　She likes thrillers .
　　My brother watches TV every evening .

　　He wants to go to a movie .
　　含有行为动词的句子,当主语是第三人称单数时,变一般疑问句要在原句子的前面加上does , ：
　　Does she have a red pen ?
　　Does he have eggs for breakfast ?
　　Does her mother buy a skirt for her ?