还给老师

to forget (everything one has learned)

surname Huan

still / still in progress / still more / yet / even more / in addition / fairly / passably (good) / as early as / even / also / else

to pay back / to return

to return sth to sb

to / for / for the benefit of / to give / to allow / to do sth (for sb) / (grammatical equivalent of 被) / (grammatical equivalent of 把) / (sentence intensifier)

to supply / to provide

prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity / old (of people) / venerable (person) / experienced / of long standing / always / all the time / of the past / very / outdated / (of meat etc) tough

teacher / CL:個|个[ge4],位[wei4]

surname Shi

teacher / master / expert / model / army division / (old) troops / to dispatch troops