I think take mobile phone to school is useful这个句子有错吗?据说是is useful用错了,

I think take mobile phone to school is useful这个句子有错吗?据说是is useful用错了,
I think take mobile phone to school is useful这个句子有错吗?
据说是is useful用错了,

I think take mobile phone to school is useful这个句子有错吗?据说是is useful用错了,
take改成taking
或者I think it useful taking mobile phone to school
I think it useful to take mobile phone to school .

take应该该为 taking

useful 没有用错。
错在一个句子有两个谓语动词了，think 和take
应该改为：I think taking mobile phone to school is useful

take应该为taking
宾语丛句中taking moblie phone为主语，is useful就没错了。