sb ⼀sth be believed to do⼀ to be doing⼀ to have d
推荐回答（1个）
说白了就是
第一个是被相信做。。。或者被相信将要做。。。
第二个是被相信正在做。。。
第三个是被相信做了。。。
举个例子
1. The refugees from Syria are believed to cause the rise in r*pe in Germany.
人们相信叙利亚来的难民将会引起德国QJ案件数量的上升。
2. The refugees from Syria are believed to be flooding into Europe in millions.
人们相信叙利亚来的难民正在数以百万计地涌入欧洲（当然了这个的确是事实）。
3. The refugees from Syria are believed to have committed various crimes in Germany since June 2015.
人们相信叙利亚来的难民自2015年6月份以来已经在德国犯下了各种罪行。
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