请问为什么苹果和鸡蛋要用,an apple、an egg 而不是a apple、a egg

请问为什么苹果和鸡蛋要用,an apple、an egg 而不是a apple、a egg a kite an egg an orange a banana an apple an apple 的意思是什么? a egg和an egg哪个正确? is this an apple an orange__an egg a egg还是an egg Eating an egg ,a bread,an apple or a cup of tea for breakfas 鸡蛋的英语是EGG,那么一个鸡蛋是A EGG还是AN EGG he has an egg and an apple for breakfast 对 an egg and an app here _____ an apple and an egg. 答案是is 还是are,为什么? egg前面用a,还是an? he likes an egg and apple for breakast. a an 填空 .aeroplane .egg