In my kids class, I was teaching "I have to _______."
The vocab's were:
clean my room
help my mom
walk my dog
do my homework
Annnnnd the most common mistake waaaaa~s *drumroll*:
"I have to do my mom"!
There were also a few "do my dog"s and "clean my mom"s thrown in there.
Asking little kids to memorize verb combinations is a bit dangerous, I've found out XD.