5、定句:句型变化很简单,先把句中动词看。be may must will can,否定句not加后边。没有现成怎么办?do does did来相伴。一二人称要转变,三单过去要还原。将下列陈述句改成否定句1:1.Heisagoodteacher.(be动词)Heisnotagoodteacher.2.Shehasalreadyfinishedhishomeworknow.(助动词)Shehasnotfinishedherhomeworkyet.3.LiMing’sfathercandrivethecar.(情态动词)LiMing’sfathercannotdri