she was his mother.这句话不是表示过去是他的妈妈,而出现在某个文章中,它是他的妈妈应该是一般现在时态,可是为什么有时候用过去时?会的给我讲讲,

Tom felt his mother knew he was lying when she looked him in the eye这句话什么意思, he asked his mother that whether she knew what was going on then的错误是 His mother was very angry She counldn't say word 改为同一句 he had to look after his mother after school because she was will 的同意句 His mother was so old that she couldn't go to work.(改为同义句) 求助（急）谁能帮我改一下这段文章的错误A boy who's father left his mother and him was very loving music.but his family was very poor.His mother was a former web designer and she also was a singer in a church band.And two jobs just t 虚拟语气中为什么用wereMary loves the baby so much as if she were his mother.这其中were为什么不改成was? His mother was often very sick,so she could not take care of him.这句话对吗?sick用very修饰? Tom was a 3-year-old boy.His mother was very much concerned about his future.One day she had a talkyu His mother was born _______ 1978 His mother was b____ ill last night his mother was ____ (bad) ill yesterday, what _you_(do)when the earthquake startedHia mother hoped__(be)a teacher when she was young.his mother hopes he __(be)a teacher when he grows up. His mother hopes he _____(be)a teacher when he grows upHis mother hopes _____(be)a teacher when she was young jerry asked his mother what was happening jerry asked his mother what was _____ _____ his mother was .because he did not finish his homework Millie was so c___that she forget to bring her homework yesterdayThe mother often d___ his little son every morning .I was born at the end of last c___ the policeman asked the obyA.where is his mother B.where his mother is C,where was his mother D.where his mother was 说原因