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

`11.`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.

`12.`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.

* Giải thích :

`-`Câu gián tiếp với "said" : S + said ( that ) + S + V lùi thì...

- Lùi thì :

Hiện tại đơn `⇒`Quá khứ đơn

Quá khứ đơn `⇒`Quá khứ hoàn thành tiếp diễn

Quá khứ hoàn thành`⇒`Quá khứ hoàn thành

Tương lai đơn `⇒`Tương lai trong quá khứ

am/is/are + going to V `⇒`was/ were going to V

will `⇒`would

Shall/ Can / May `⇒`Should / Could/ Might

Should / Could/ Might/ Would/ Must `⇒`Giữ nguyên

- Đổi đại từ nhân xưng, tính từ sở hữu và đại từ sở hữu

I `⇒`She/ he

We `⇒`They

You `⇒`I, he, she/ they

Us `⇒`Them

Our `⇒`Their

Myself `⇒`Himself / herself

Yourself `⇒`Himself / herself / myself

Ourselves `⇒`Themselves

My `⇒`His/ Her

Me `⇒`Him/ Her

Your `⇒`His, her, my / Their

Our `⇒`Their

Mine `⇒`His/ hers

Yours `⇒`His, her, mine/ Theirs

Us `⇒`Them

Our `⇒`Their

- Thời gian, nơi chốn :

Here `⇒`There

Now `⇒`Then

Today `⇒`That day

Yesterday `⇒`The previous day, the day before

Tomorrow `⇒`The following day, the next day

Ago `⇒`Before

Last week `⇒`The previous week, the week before

Next week `⇒`The following week, the next week

This `⇒`That

These `⇒`Those