lista de algunos verbos

present                        gerun                       past                          past participle
play                             playing                     played                      played
visit                             visiting                     visited                       visited
come back                  coming back            came back                came back
arrive                          arriving                    arrived                      arrived
see                             seeing                       saw                          seen
take                            taking                      took                          taken
eat                              eating                      ate                             eaten
go                               going                       went                          gone
live                              living                        lived                         lived
discover                      discovering              discovered                discovered
invent                          inventing                  invented                    invented
write                           writing                     wrote                        written
study                           studying                  studied                       studied
finish                           finishing                   finished                        finished
buy                             buying                     bougth                        bougth
identify                        identifying                identified                     identified
wait                            waiting                     waited                         waited
begin                          beginning                  began                          begun
include                        including                   included                      included