A cow is a useful animal这句话中的冠词是否错误用The 或者Cows显然都正确不过似乎A＋名词似乎也可以表示一类物那么这样表达可以吗useful前应用a绝对没错cow究竟是不是复数名词？如果是，用The似

That is a cow. ( )useful book a/an an useful animal?还是a useful animal? A dictionary is an useful book.找错哪里错了? 改错：A fox is an useful animal.同题 The dog is (a/an/the//) useful any more useful前是加a还是an an ufesul还是a useful Dictionary is ______ useful tool.A an B a C / DDictionary is ______ useful tool.A anB aC /D the __ information it is Just put it into the computer .A How useful an B what useful C How useful D What a useful It is a cow(变成一般疑问句) the meat from a cow is called----- a,is,a,cow,calf,baby(.) 连词组句A cow baby is a calf a,is,a,cow,calf,baby(.) 连词组句A cow baby is a calf. This is quite a useful book .解释一下quite为什么放在 a前面,useful是什么意思,为什么不定冠词不使用an? This is ______ useful book. A. a B. an C. the D/This is ______ useful book.A. a B. an C. the D/要解释 ( )elephant is ( )useful animal to p( )elephant is ( )useful animal to peopleA an,a B an,the C the,an D /,an回答时请适量说明原因 _______horse is a useful animal .