certainly的形容词形式

certain adj. 某一；必然的；确信；无疑的；有把握的；

例句

Certain people might disagree with this.

某些人对这事可能不会赞同。

You owe a certain person a sum of money.

你欠着某人一笔钱。

Certain passages were excised from the book.

书中某些段落已删去。

Some students are exempt from certain exams.

有的学生可免除某些考试。

Solids turn to liquids at certain temperatures.

固体在一定温度下转变成液体。

People can react badly to certain food additives.

人们对某些食品添加剂会严重过敏。