Her phone card ran out during her conversation with her mother -> Her phone card ran out _____ her mother (while)

`\color{green}{\text{@Quyen}}`

`@` Thì QKTD : S + was/were + V-ing

`+` When + QKTD, + QKĐ

`=` When + QKĐ, + QKTD

`=` `S_1` + was/were + Ving + while + `S_2` + V2

`->` Diễn tả hành động đang diễn ra thì có một hành động khác chen vào

`+` `S_1` + was/were + Ving + while + `S_2` + was/were + Ving

`->` Diễn tả `2` hành động diễn ra song song

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

`->` Her phone card ran out while she was talking to her mother.

Her phone card ran out during her conversation with her mother - cấu trúc: during + N (danh từ) Vị trí: Đầu hoặc giữa câu

=> Her phone card ran out while she was talking to her mother. - cấu trúc: while + clause (mệnh đề) Vị trí: Đầu hoặc giữa câu