Heinsistedthathewasreallyverytiredandthatheshouldbeallowedtohavearest.句中的“should”可不可以用“must”,

Question

He insisted that he was really very tired and that he should be allowed to have a rest.
句中的“should”可不可以用“must”,

Answer 1

并不是说insist that+(should)+动词原形是固定搭配.
要看insist在句子中是什么意思.
如果是“坚持说”的意思,那么后面的宾语从句不虚拟,即不用（should）+动词原形.
如果是“坚持要求”的意思,那么后面的宾语从句就要虚拟.
在这一句中,insist有两个意思.
He insisted that he was really very tired中insist是“坚持说”的意思,即“他坚持说他很累”,所以不用should+动词原形.
然而,在 that he should be allowed to have a rest.中insist是“坚持要求”的意思,即“他坚持要求他应该被允许休息”,此时宾语从句需虚拟,即加should（可省略）+动词原形的虚拟形式.
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