认为做某事怎么样用英语怎么说

"To think something is (adjective)" 可以用 "to consider something (adjective)" 来表达。
例如：
I consider the idea to be great. (我认为这个想法很棒。)
He considered the movie to be boring. (他认为这部电影很无聊。)
"to consider" 来自拉丁语 "considerare"，意思是 "to look at carefully, to think about"。在这种用法中，我们用 "to be (adjective)" 来表示认为某事是什么样子。