I have a sister和I have one sister到底该用哪一个?

I have a sister和I have one sister到底该用哪一个? I have a sister 改写 i donts have a sister还是i dont have sister I have one sister ang brother I have one sister怎么提问 Do you have a sister ? ---yes i have哪一个单词错了 I have a sister的同义句 I have a sister who plays piano. Lily is my sister.I have()sister i have one brother and one sister否定 I don't have a sister or brother和.I don’t have a sister or a I have 6 sons.Each one has a sister.How many children have