"Họ cần đọc lại quyển sách đó."

Translation: They need to read that book again.

[lyzasrey]

Can anyone shed light on lại? Where can it be positioned in a sentence? I'm confused.

[Soufeel]

"lại" comes after a verb, it means you do something again, do that one more time. In this sentence, "lại" is "again":

"read again" means "đọc lại",

"read that book again" = "Đọc lại quyển sách đó"

[TehVanarch]

Additionally, it's also homophonous with a particle that denotes that one action happens rather than another.

e.g. Khi tôi đến thì anh ấy lại đi = He left when I arrived.*

[Br.MinhDung]

In another sentence, the order was reversed. It said "lại thấy". Does it matter where it goes?

[Cxmayuga]

Don't you mean "When I arrived, he left."?

[TehVanarch]

Yeah I had a brain fart in that particular instance. It can be taken to mean either "When I arrived he left" or "He left when I arrived" or "He left as I arrived".

[LiKenun]

Also think of the prefix “re-” in English. To read something again is to reread something.

[Br.MinhDung]

In another sentence, the order was reversed. It said "lại thấy". Does it matter where it goes?

[HaoLien]

Is cuon and quyen not interchangeable? Not accepted here.