be believed 后面必须加to吗?是固定搭配吗be believed to do sth

be believed 后面必须加to吗?是固定搭配吗be believed to do sth to 后面必须加动词原形吗 said后面必须加to吗 be believed to 什么意思? be believed to have done 请问be动词必须得放到used to后面吗? to的后面必须加动词原型吗?为什么啊 be believed to 是据说的意思吗? be glad to 后面要加动词原型吗? want 后面必须加to吗?比如anywhere you want 还是want to? afford to be 后面加什么词性 be able to 后面能不能加形容词 used to be后面加什么词 be addictive to后面加什么谢谢! used to be used 后面加什么 there be后面必须跟doing吗 The book _____ by a famous writer.A.believed to writeB.was believed to writeC.believed to be writtenD.was believed to be written The government was believed to be considering a law making it a crime to import any kind of weapon为什么was believed to be considering 要加一个be?