1. Tell some students to sit in the classroom 2. I agree. I also think Dave should sit in on the interview. I'll find out when he's available. 3. Tell some students to sit in on class.
Q) I found the example #1 and #2 on the net. I was wondering when you put the preposition on with the expression "sit in." Is #3 natural about the use of "on?"
Top answer
1. Tell some students [to sit] [in the classroom], and tell some [to sit] [in the hallway]. ) 2.
— CalifJim
1.
Tell some students [to sit] [in the classroom], and tell some [to sit] [in the hallway].
) 2.
I also think Dave should [sit in] [on the interview].
(should be present and observe at the interview) 3.
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1. Tell some students [to sit] [in the classroom], and tell some [to sit] [in the hallway]. (Literal sitting.) 2. I also think Dave should [sit in] [on the interview]. (should be present and observe at the interview) 3. Tell some students [to sit in] [on the class]. (to be present and observe when class is in session; either once or for the entire semester)
"sit in on" is used with objects like "interview", "discussion", "meeting" etc.
"sit in on class" is possible, but it suggests something different from attending class in the normal way -- some kind of observational role, for instance.