saw
recognize
recognized
recognizing
wonder
wondered
wondering
notice
noticed
noticing
hear
heard
hearing
see
seeing
note
noted
noting
spot
spotting
spotted
realize
realized
realizing
perceive
perceived
perceiving
glimpse
discover
discovered
discovering
overhear
overheard
overhearing
listen
listened
listening
detect
detected
detecting
observe
observed
observing