You should see light sweeping across the specimen -- if not, you have probably failed to set the filters or knobs on the microscope correctly.
(You; should see; light sweeping) (you; have probably failed; to set the filters or knobs on the microscope correctly) (you; to set correctly; the filters or knobs; on the microscope)
You you you
should see have probably failed to set correctly
light sweeping
to set the filters or knobs on the microscope correctly
the filters or knobs on the microscope