1.电话在响,但是当她进了门,铃声就停了.(by the time)
The phone is ringing,by the time she comes into room,the phone ring stops.
2.她太激动了,以至于不知道该说些什么.(so...that;倒装句）
She is so excited that she doesn't know what to say.
3.那就是他今天为什么没有到会的原因.（That's why...)
That's why she doesn't attend the meeting.