用DO you think做插入语造三个句子,

问题描述:

用DO you think做插入语造三个句子,

Do you think it's necessary to learn English?(你认为学英语有必要吗?)
Do you think we should go there by train?(你认为我们应该坐火车去那儿吗?)
Do you think she is right?(你认为她是对的吗?)