pencil sharpener为什么去掉pencil意思没变?是否有很多其他的英文单词也一样?请举三个例子.就因为这样，所以让我在记英语的时候有点小苦恼~

pencil sharpener是什么意思? pencil-sharpener怎么读? 组词成句；that whose sharpener pencil That is my pencil sharpener 改为一般疑问句为什么Is要放在前面? I have a pencil sharpener 怎样变否定句为什么这样变详细说明 here is your pencil sharpener.( ) ( ),jane. pencil sharpener的中文意思是什么 ____(she)pencil sharpener is in the pencil case. That's a pencil sharpener in English.对a pencil sharpener 提问. This is my a pencil sharpener in English.对a pencil sharpener 提问 this is a pencil sharpener in english 对 pencil sharpener提问 is,sharpener,the,what,English,pencil,for(?)连词成句 是What is the pencil sharpener for English?还是What is the English for pencil sharpener? What is this?----This is a pencil sharpener改错 This is a pencil sharpener.(改为一般疑问句) pencil,your,this,is,sharpener如何合成一个句子? 那是我的铅笔刀 英语怎么说（）that()()pencil sharpener this is your pencil sharpener.变复数________your___________ This is Lisa's pencil sharpener.改一般疑问句