Are the highlighted words between the two dashes correctly used? What about ‘after’? Is it correctly used?
“As a sort of evaluation, you have to stage/showcase a playlet—action, adventure, comedy, or drama—showing the importance of bonding with parents and the steps in resolving conflicts between them,” the guidance counselor told the students after grouping them into four.
Don't get into a habit of using a lot of dashes. . after grouping them into fours .
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Yes, that's all OK, as informal English.Don't get into a habit of using a lot of dashes.
. . . after grouping them into fours. (ie more than one group of four)