I know all teachers are right, but, coul you tell me the difference btw careful +“of”,“about”, “with”, “on” ? Are they interchangeable?
Coul you answer my 2 questions in PS?
Careful of has the sense of being cautious with the idea of mind. Often a notice warning that there is a dog in someone’s house is: Beware of the dog.
Careful about has the idea of paying attention to something you are doing - some kind of action as in: Be careful about crossing this road because the cars travel very fast.
Careful with suggests handling something/someone with partucular attention as in: Be careful with that glass ornament because it is very delicate.
Careful on is somewhat unusual because ‘on’ transfers more to another object rather than having a close association with ‘careful’ as in: Be careful on getting (when you get out of) out of the train.
From the choice available in your sentence, it would seem that ‘of’ is the most suitable.