知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 "I Obtained this thermos for free" Appears completely standard to me. "That thermos was for free" Seems bad: I would just say "That thermos was free." Every person is missing the main place. The usage of prepositions is idiomatic. So it differs with regards to the speaker. https://sexeslive.com/