A crowd gathered to see what had happened.（英译中)

He pushed his way to the front of the crowd.（英译中)

I had remembered in minute detail everything that had happened.（英译中)

I opened my mail and was surprised to see a broken vase.（英译中)

I know what happened.（英译中)

I see what you mean.（英译中)

I happened to see her yesterday.（英译中)