帮忙回答下这篇文章的几个问题

帮忙回答下这篇文章的几个问题
My mother is an English teacher.Students all enjoy her class.And she's not only a good teacher,but also a great mother.I remember when I caught a fever at midnight last year,my mum took me to the hospital as fast as she could.When we got home after my injection,it was about 5 o’clock in the early morning.My mum only slept 2 hours because she had to wake up at 7 o’clock to prepare breakfast for me,and then she went to work.She must be very tired that day.
My mum is not very beautiful,but I like her very much.
1.为什么要用mum 不用mother,2.caught 在本文怎么没翻译出来,是什么用法.3.she could在本文为什么要放在后面,