Both structures can be used to insist that people do things or do not do things.
#1 You're finishing / going to finish that soup if you sit there all afternoon! #2 She's taking / going to take that medicine whether she likes it or not!
The above is from Swan's Practical English Usage. Regarding the example sentence #1, I don't quite understand in what situation it is used. Could you please explain it?
Top answer
You said it yourself: to insist that people do things or do not do things. Child: I don't want any more soup. Mother: You have to finish it, dear.
— Fivejedjon
You said it yourself: to insist that people do things or do not do things.
Child: I don't want any more soup.
Mother: You have to finish it, dear.
It's good for you.
Child: No.
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You said it yourself: to insist that people do things or do not do things.
Child: I don't want any more soup. Mother: You have to finish it, dear. It's good for you. Child: No. I want the next course. Mother: You're finishing / going to finish that soup if you sit there all afternoon!