以为的短语用英语怎么说

这个短语是 "to think something is the case"，它来源于英语中 "to think" 的意思，指的是用心思考或想一想。例句如下：
I thought the movie was going to be good, but it turned out to be terrible. （我以为电影会很好看，但事实证明它非常烂。）
She thought she had left her keys on the table, but they were actually in her pocket. （她以为她把钥匙放在桌子上了，但实际上它们在她的口袋里。）
He thought he knew the answer to the question, but he was wrong. （他以为他知道问题的答案，但是他错了。）
希望这个回答对您有所帮助。