If s.o. does s.t for even a moment, the following result will necessarily occur • Once someone starts something, the person can’t stop it If the boss even touches the mic for a second, he won't let anyone else sing karaoke ALL night 〜したら • いったん〜たらそのまま • いったん〜たら必ず
The opening sentence is good. "I want you to listen to the following story". If you just obediently lean in your ears, it's certain that you won't be able to stop (reading). (Nikkei book review)
see http://www.geocities.com/easykanji/jlptgrammar.html
Once someone starts something, the person can’t stop it.
Notes: Easily confused with ~kiri, but the meanings are completely different and ga saigo doesn’t mean ‘for the last time’. Always used with past tense verbs.
dc
Ref # Kanzen Master Level 1 - p16 - no.12
LR
There are cases where this is similar to 一旦〜 (Once you 〜)