1. My uncle told me that he was going to visit his grandparents.

S + told + O + (that) + S + V (lùi thì)

TLG --> was/were + going to + V1 

2. If you don't finish your assignments before class, you will be punished.

If loại 1: If + HTĐ, S + will/can/shall .. + V1 

`color{orange}{~LeAiFuRuiHuiBao~}`

`1`. My uncle told me that he was going to visit his grandparents.

`-` Tường thuật: S + told + O + that + S + V(lùi thì)

`-` TLG `->` was/were going to V

`2`. If you don't finish your assignments before class, I will punish you.

`-` Câu điều kiện loại `1`:

`->` If + S + V(HTĐ), S + will/modal verbs + V