en_tn/rev/20/01.md

Then I saw

Here "I" refers to John.

deep and endless pit

See how you translated this in Revelation 9:1.

dragon

See how you translated this in Revelation 12:3.

a thousand years

"1,000 years" (See: rc://en/ta/man/translate/translate-numbers)

he must be set free

AT: "God will command the angel to free him" (See: rc://en/ta/man/translate/figs-activepassive)