`-` Câu tường thuật : 

`+` S + said + that + S + V ( lùi thì )

`+` S + said to / told + O + that + S + V ( lùi thì )

`-` HTTD `->` QKTD : S + was / were + V-ing

`-` HTĐ `->` QKĐ : S + Ved / V2 `-` S + was / were + adj / n

`-` TLĐ `->` TLTQK : S + would + V

`-` QKĐ / HTHT `->` QKHT : S + had + V3 / PII

`42`.Our teacher said that they were learning more about our universe

`43`.Dr.Nelson said that scientists had made various applications in long distance communication

`44`.Our Chemistry teacher told us that science was a good and useful servant , but it was a bad destructive master

`45`.Our headmaster said that space tourism would broaden our knowledge of space

`46`.Our History teacher told us that during the time in Paris in 1946 , Uncle Ho had attracted several Vietnamese scientists to return to the country

`47`.Our Math teacher said that Professor Le Van Thiem had believed in the importance of education and science , so he had founded a teacher training college and a college of fundamental science

`\text{# Kirigiri}`