you can't teach an old dog new tricks
It is impossible to change people's habits, traits, or mindset.
ADV
effectively
My math teacher effectively taught the difficult concepts by using real-world examples.
VERB + TEACH
try to
My teacher tried to teach us the importance of reading every single day.
be qualified to
My mother was qualified to teach mathematics but chose to work as an engineer instead.
be designed to
This new software program is designed to teach children how to read more effectively.
help (to), help sb (to)
PREP
about
My grandmother taught me about gardening when I was young.
to
My father taught basic computer skills to senior citizens at the local library.