when the situation becomes very difficult or challenging
状況が非常に難しくなるとき (jōkyō ga hijō ni muzukashiku naru toki)
"When the going gets tough, the tough get going."
"状況が困難になるとき、強い者は前に進む。" (**jōkyō ga kon'nan ni naru toki**, tsuyoi mono wa mae ni susumu)
I do not know the answer to a question
a polite expression used when meeting someone for the first...
to watch or monitor something or someone carefully
to verify that someone or something is doing well
something attractive but not allowed or morally wrong
to make a mistake; to fail at something important
