These words all mean to rest your weight on your bottom with your back upright, for example on a chair. 以上各词均含坐下之义。

• sit to rest your weight on your bottom with your back upright, for example on a chair 指坐：◆May I sit here? 我可以坐在这儿吗？◆Sit still, will you! 坐着别动！ NOTE Sit is usually used with an adverb or prepositional phrase to show where or how sb sits, but sometimes another phrase or clause is used to show what sb does while they are sitting. * sit 通常与副词或介词短语连用，表示坐的地方或方式，但有时也与另一短语或从句连用，表明坐着时在做某事：◆We sat talking for hours. 我们坐着谈了好几个小时。
• sit down/sit yourself down to move from a standing position to a sitting position 指坐下、就座：◆Please sit down. 请坐。◆Come in and sit yourselves down. 都进来坐下。
• be seated (formal) to be sitting 指坐着：◆She was seated at the head of the table. 她坐在桌子的上座。 NOTE Be seated is often used as a formal way of inviting sb to sit down. * be seated 常为请人就座的正式表达方式：◆Please be seated. 请就座。
• take a seat to sit down 指坐下、就座 NOTE Take a seat is used especially as a polite way of inviting sb to sit down. * take a seat 尤作请人就座的礼貌用语：◆Please take a seat. 请坐。
• perch (rather informal) to sit on sth, especially on the edge of sth 指坐在…上，尤指坐在…边沿：◆She perched herself on the edge of the bed. 她坐在床沿上。 NOTE Perch is always used with an adverb or prepositional phrase to show where sb is perching. * perch 总是与副词或介词短语连用表示坐的地方。

Patterns

• to sit/sit down/be seated/take a seat/perch on sth
• to sit/sit down/be seated/take a seat in sth