Clean Microscope<br>Viktor could not get his microscope to focus. His professor came to help. His professor also could not get it to focus. The professor wiped the lens with a solvent. He was then able to focus the lens.
Viktor now knows how to focus the lens.
After knowing that the professor used a solvent to clean the lens, Viktor will then know to do that in the future if the same thing happens in the future.
( z1 know :ARG0 ( z2 person :name ( z3 name :op "Viktor" ) ) :ARG1 ( z4 focus :ARG0 z2 :ARG1 ( z5 lens ) ) :time ( z6 now ) )