to have uncertainty regarding something
何かについて不確かであること (nanika ni tsuite futashika de aru koto)
"I have serious doubts about his honesty."
"彼の誠実さについて深刻な疑いがある。" (kare no seijitsusa ni tsuite shinkoku na **utagai ga aru**)
to negotiate and agree on trade tariffs with another party
to plan specific chunks of time for tasks
to keep money for future use
to conduct formal discussions to reach an agreement
to become extinct or disappear completely
to discuss or talk casually with a friend
