3. "Let's go out for dinner tonight," Mary said.

Mary suggested.................

`color{red}{#lgdr}`

`3` Mary suggested going out for dinner that night .

`-` Gián tiếp gợi ý đề nghị : S + suggest + V_ing + O .

`-` tonight `->` that night .

`3.`"Let's go out for dinner tonight," Mary said.

`=>` Mary suggested going out for dinner that night

`-` Giải thích : 

`+)` Câu đề nghị : Let's + V `=` suggest + Ving

`+)` lùi tonight `\to` that night

`-` Dịch : Mary gợi ý đi ra ngoài ăn tối tối nay

$\color{red}{@NgVanChi}$