Could you help me with a few questions?
1) Does it sound odd to say "slack off on diet"?
2) If someone distract you while you are talking to a waiter, for example, placing your order, or if you are doing your homework, could you say "Don't mess me up"? of "Don't trip me up" "Don't throw me off"? What would you say? None?
3) Do you say "for" or "from" a subject, class? or neither?
(A mom talking to her son):"What subject/class do you have homework for/from today?"
"What subject/class is this notebook for/from?
4) Do you say "Don't turn the ventilator/fan way up" or "Don't turn the ventilator too far up"? Or neither?