“在”,《说文》:“存也,从土,才声。”“在”的本义是存在。事物的存在,须有一定的空间或时间。故“在”用于表示人或事物的位置时,总是与表示处所、时间的名词连用。如“在机关”“在学校”“在去年”“在今天”。有时,名词后面还要加方位词。如“在家里”“在桌上”。有些词语,在 “In”, “Shuo Wen”: “save also from the earth, talent.” “In” the original meaning of existence. The existence of things, there must be some space or time. Therefore, “when” is used to indicate the position of a person or thing, it is always used in conjunction with the term that means place or time. Such as “at the authorities” “at school” “last year” “today”. Sometimes, place words after the noun. Such as “at home” “on the table.” Some words, at