This is a knee pad.改为复数形式

This is a knee pad.改为复数形式 英语翻译this pant has a top loading knee pad insert,with flap closure This is a big farm.改疑问句 This is a garden改复数 this is a ruler.改复数 This is a Engilsh book.改病句 改病句 This is my a cup this is a black cat.改否定句怎么改 英语改否定句 Is this a ruler 如何改 JAR PAD MUST BE IN PLACE BEFORE THIS BLENDER IS Is this a plane?yes,it is 改复数句 is this a boy or a girl改复数句 31.I did not know .A.what an I-pad was.B.an I-pad was what.C.what is an I-pad.D.what an I-pad. This is a answer这句话哪里出错?改病句 (1)This is a answer This is a “P”and this is a “M”怎么改 This is a big kiye怎么改疑问句 英语 This is a ruler怎么改一般疑问句 This is a bottle of milk.怎样改写成复数?