`1`. That is the river in which/where we use to swim.

`-` Where thay thế cho danh từ chỉ nơi chốn.

`-` N(địa điểm) + where + S + V

`-` In which `=` Where

`2`. That river, where/in which the teacher didn't allow the students to swim, is very deep.

`-` Where thay thế cho danh từ chỉ nơi chốn.

`-` N(địa điểm) + where + S + V

`-` In which `=` Where

`\star` Which

`+` Thường sử dụng để làm chủ ngữ, tân ngữ, dùng để thay thế cho các danh từ chỉ vật.

`\star` Where

`+` Dùng để thay thế từ chỉ nơi chốn

`+` in/in/at + which `=` where

`----------`

`1.`

`->` That is the river in which we use to swim.

`->` That is the river where we use to swim.

`2.`

`->` The teacher didn't allow the students to swim in the river, which is very deep.

`->` The river, in which the teacher didn't allow the students to swim, is very deep.

`->` The river, where the teacher didn't allow the students to swim, is very deep.

`------`

$\color{green}{\text{#NhatHuyThichChoiLiqi}}$

$\color{orange}{\text{Chúc bạn học tốt ạ :33}}$