Question

There was nothing for them to dobut to remain silent错哪了，实在看不懂。？？

Answer 1

把but后面的to去掉就对了。There was nothing for them to do but remain silent.这里的but是介词,其后常跟不定式做宾语，不定式是否带to的判定方法是：but之前有个行为动词do,but之后不带to。这个句中中but前有do ，所以but后面就不要加to了。