this is an apple.改成复数形式

this is an apple.改成复数形式 is this an apple an orange__an egg This is an apple就an apple部分转换提问 This is an apple 变为复数句子 an,is,apple,this连词成句 There is an apple in the box.改成否定句 This apple is sweet.改成否定句,意思不变 this is an apple 和 this is apple 哪个语法是正确的 this is an apple中为什么要用不定冠词不用可不可以,能不能写成This is apple These are an apple and a pear.还是This is an apple and a pear. He has three bananas.(改成一般疑问句) This is on apple.对on apple提问. This is an interesting film.改成感叹句 , this is an apple怎么改为复数句 This is （an apple）对括号部分提问 This is an apple,that's a knife句型转换 This is (an apple)打括号的地方提问 This is an red apple.(哪里错了) This is an red apple.写出正确的句子