with a lot of difficulties to settle,they had to stay in the lab.不定式用主动to settle还是被动式to be settled?

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with a lot of difficulties to settle,they had to stay in the lab.不定式用主动to settle还是被动式to be settled?

with a lot of difficulties to settle,they had to stay in the lab.不定式用主动to settle还是被动式to be settled?
with a lot of difficulties to settle,they had to stay in the lab.不定式用主动to settle还是被动式to be settled?

with a lot of difficulties to settle,they had to stay in the lab.不定式用主动to settle还是被动式to be settled?
按理来说settle和difficulty是动宾关系,应该用被动,但很多情况下,如果动词和主语相关,或者动词的主语是广泛的群体时,一般用主动形式,如:
I have a letter to send 是我要自己去寄信
I have a letter to be sent 是我要他人帮我寄
English is difficult to learn.主语是广泛的大众,所以不用被动

with a lot of difficulties to settle,they had to stay in the lab.
不定式用被动式to be settled。因为a lot of difficulties是【需要被解决to be settled】