在The bird is her friend since she brought it home中,明明有since但为什么是用is而不是had been?

The bird is 在The bird is her friend since she brought it home中,明明有since但为什么是用is而不是had been? The crow is a bird what's her bird's name 同义句what's the _______ her bird? Look!The bird is （ ） the tree. (英语)用be动词的适当形式填空1she()a teacher.her name()mary 2l()aboy.my name()li ming 3who()this girl?she()limei 4how old()you?l()eleven 5what()this?lt()a bird.lts name()polly 6tian cong()a good boy7you()a girl.l'm a boy 8the woman()my fri Fri, A bird is ____ with the cat. 连词成句:is,flying,bird,the, 用the is bird flying连词造句 the bird is stil alive 还是living what is the bird doing?怎么回答? Jenny is feeding the bird.意思是什么 The best season for bird watching is Is the bird still a () 填空 what colour is the bird 怎么回答 where are the cat and bird 这句话对吗?为什么老外都用is?用and 需要用相邻原则吗?很明显，cat 和bird 并不是一个东西；另外，this is Lucy and her brother Peter 也是老外用的，and 在哪些情况下用就近原则 The bird's name is Polly .(改为同义句)The----- ------ the bird is Polly.