今天看到They are my sister, brother and I.不是用me吗?

今天看到They are my sister, brother and I.不是用me吗? This is my friend 和 These are my sist 改成否定句怎么改啊,急... They are my boys. They are my favourite.还是They are my favourites they are( my) dogs提问 They are all my ----------(cousin) They are all my loves 改错;they are my geandparents. （） are they? Ther are my parents. They are my grandparents.对my grandparents提问.they. who are they ? they are my grandparents . 什么意思 they are my favourite animals.they are ( l ) Who are they?They are my friends from different cWho are they?They are my friends from different c_____ they are my friend和these are my friend改错 Bob sits on my right.Lucy sist on my left(合并成一句) They are my parents,my sister,my brother and I. they are my friends 变为一般疑问句 They are the wonders of my world.