they certainly are造句

• They certainly are
  他们的确是这样
• And what is more , that reflection could not occur to the doctors because they saw that they unquestionably were of use ; and they certainly were of use to all the rostov household
  但是主要的医生们所以想不到这个道理是因为他们看见他们无疑是有用的，对罗斯托夫全家也的确有益处。
• That would be the case if our schools and colleges were at their very best , which they certainly are not , and even if the students were among the best and the brightest as well as conscientious in the application of their powers
  假如中小学和大学处于最佳状态（但事实并非如此） ，假如学生是最优秀的、最聪明的，而且能自觉发挥它们的才能，那么情况也许会这样。