All laboratory experiments have a pre-laboratory assignment that should be completed before the beginning of the laboratory session.
(All laboratory experiments; have; a pre-laboratory assignment that should be completed before the beginning of the laboratory session) (a pre-laboratory assignment; should be completed; T:before the beginning of the laboratory session)
All laboratory experiments a pre-laboratory assignment
have should be completed
a pre-laboratory assignment that should be completed before the beginning of the laboratory session
T:before the beginning of the laboratory session