1, Said -> said that
Uyen said that she must go then.
2, didn't see -> have not seen
I saw Bill this morning, but I have not seen him since then.
3, since -> when
I went to bed before nine when I was a child.
4, next day -> the following day
My father asked me to pay much attention to English the following day.
5, with -> of
Children are fond of swimming in summer.