went on a school trip
had a school trip
were/was on a school trip
应该是这样吧，时态为过去时（已游完），be on a trip ,have a trip ,go on a trip 都是一个意思，去旅游
On Saturday, my friends and I arranged to go outing. We set the time in eight in the morning. Go places of the west. The road is near, we're going to walk. We are ready to fly a kite in there, swimming, boating, etc. We played really very happy! In the sun was setting, we went home.
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