单数句改成负数句it's a pencil.this is a tennis racket.is he your friend?the ruler is on the deskis that your hat

单数句改成负数句it's a pencil.this is a tennis racket.is he your friend?the ruler is on the deskis that your hat It's a pen改成否定句 改成复数句.What is it?It's a box.改成单数句.The children are YOUNG Pioneers.改成复数句,并作肯定回答.Is this a red pen?改成复数句,并作否定回答Is that an English book?改为单数句Those are apples改为单数句Those a 改成单数句, 单数句写成负数句I am a student It's a black cat .改成否定句 It's an eraser.改成复数句 It’s dangerous.改成否定句 单数句变复数句,复数句变单数句.It is a bus____________________ Are you tourisits?(改成单数句) Is your friend a tourist,too.(改成复数句) This is a boy.改为一般疑问句That is my penci.改为一般疑问句.My name is Linda.改为否定句.It‘s an eraser in English.对划线部分提问 划线部分是an eraser.not,English,this,dictionary,an,is(.)连词成句 that's a leaf.改成复数句 英语翻译①While watching television,we heard the doorbell 【rings】.上句中的【rings】要改成【ring】才可以.为什么呢?doorbell 不是第三人称单数么?为什么不要加S?②It isn't much of a car . They are old monkeys?改成单数句 Those are old libraries.改成单数句 Are they mice?改成单数句 are they ruler 改成单数句 It's a very funny comedy.改成同义句（The comedy___ ___ ___.中间填什么?