visit
visit / visited / visited / visiting
see
see / saw / seen / seeing
climb
climb / climbed / climbed / climbing
travel
travel / traveled / traveled / traveling
stay
stay / stayed / stayed / staying
write
write / wrote / written / writing
eat
eat / ate / eaten / eating
swim
swim / swam / swum / swimming
buy
buy / bought / bought / buying
go
go / went / gone / going