This sentence needs to be checked by a native speaker.
この文はネイティブスピーカーがチェックする必要があります。
Tom carefully checked that the gas was turned off.
トムはガスが止まっていることを注意深く確認した。
Tom checked to make sure the gas was turned off.
トムはガスが止まっていることを確認した。
"Don't you think that people from English-speaking countries earn an unreasonable amount from the English language industry? Since I'm Japanese, I'd like to use materials exclusively made by Japanese people." "But you know, you can't really tell if the English is good or not unless it's been checked by a native speaker." "What do you mean by good English!? English used by native speakers? Are natives really that great, anyway?"
The shopping festival that everyone had been waiting for starts today. Because of this, the security force has thoroughly checked their plan to protect the safety of those attending for any flaws.