没看懂你的问题是什么意思.
Sam was sure that the wallet must had been found by one of the villagers,but it was not returned to him.这句话是正确的.
Sam was sure that the wallet must have been found by one of the villagers,but it was not returned to him.这句话是个病句.
没看懂你的问题是什么意思.
Sam was sure that the wallet must had been found by one of the villagers,but it was not returned to him.这句话是正确的.
Sam was sure that the wallet must have been found by one of the villagers,but it was not returned to him.这句话是个病句.