是an English book还是a English book?

是an English book还是a English book 是an English book还是a English book? an useful book还是a usefull book? 是an useful book还是a useful book 加a 或者an 主要看什么 ————English book前加an还是a Each student _____(have) an English book.They each _____(have) an English book.请问大师 这个怎么区别 主语是单数还是复数啊 二选一就好,是 an English dictionary 还是a English dictionary an还是a?//?如上 it is an interesting book 变感叹句是how interesting an book 还是 how interesting a book? We saw many people________(放飞）kites in different colors near the lake.注意时态加解析（乱回答者勿进入,还有是an english book 还是a english book 是用this is a book of english 还是用this is a book with english为什么 that is an english book划线提问,把an english book划了线,提问是? a English teacher 还是an English teacher 是a useful book,还是an useful book.为什么?不是所有元音开头的单词前面都加an吗? I have _______ English book.a an the A; Who _____ an English book?B; I do . The penilbox _____ _____ a ruler _____ an English book. There is a book on the desk,and ____is an English book A.that B.it到底用that还是it? There is a interesting book.还是an interesting book?