怎么回事sit down in the chair呢?怎么会用in呢?

怎么回事sit down in the chair呢?怎么会用in呢? I just ( ) at the office for most of the day,and I do no exercise.A.sit around B.sit in C.sit down选哪个啊? 看例句,写相类似的句子.Model:Don't eat in the class.Please sit down. 写六句类似的句子,例：Don't eat in the class.Please sit down sit down to the table或是sit down for the tableMeal is ready .Let's sit down for the table. Sit down on the chair.是什么意思 I ask you to sit down --- table ,not to sit down---the table.I ask you to sit down --- table ,not to sit down --- the table.填介词 [英翻中]sit down on the bench,loving the how warm it is from sitting in the sun. in the evening,the family sit down to a big goose dinner为什么不用过去时?还有为什么不用复数?sit过去式不是sat let's sit down and wait.don't run in the snow.全部改为反意疑问句 为什么不可以说sit down by the table?为什么不是sit down by the table,而是sit down at the table? You can come in and sit down.(改为祈使句) Jane,come in and sit down,piease.改为同义句 come in and sit down please作相应回答 come in and sit down please作相应回答 是sit in the sofa 还是sit on the sofa? 是sit on the chair还是sit in the chair Sit on the grass.还是 Sit in the grass?