Viết lại câu sao cho nghĩa ko đổi:
1. He was delighted to receive his aunt's letter.
-> He was delighted that ...............................................................
2. I'm very sad that l wasn't accepted in that group.
-> l'm very sad not .........................................................................
3. they will show the time machine to the public when they finish it.
-> The time machine ......................................................................
4. Did you walk to school yesterday ?
-> You .............................................................................................