Question

句型转换

He looks after his sick mom,and he thinks he has a duty to do so.
He thinks that his duty is looking after his mom请问这种转换是不是正确的
对不起，我想知道的是我这种转换是不是对的，为什么

Answer 1

1.He thinks that his duty is looking after his mom.
他认为他的责任是照顾他妈妈。（强调他的责任是照顾他妈妈，而不是其他的）
2.He looks after his sick mom,and he thinks he has a duty to do so.
他照顾他生病的妈妈，他觉得他有责任这样做。
3.He thinks that it's his duty to look after his sick mom.
他认为照顾他生病的妈妈是他的责任。（第2、3句都是强调照顾生病的妈妈是他的责任，是他该做的）
你转换出来的那个句子语法上是没有问题的，但是跟原句表达的意思还是有点小偏差，你可以可以参考上面的翻译。然后至少还少了一个sick（mom）。第3句与原句意思更接近一些。

Answer 2

He thinks that it's his duty to look after his sick mom.