[译] 不久的将来肯定会发生月食。
[误] It is sure that there will be lunar eclipse in the near future.

[正] It is certain that there will be lunar eclipse in the near future.
[注] 英语中 sure 与 certain 都有"肯定的"、"无疑的"之意，可作表语，引出宾语从句，如：She was sure (certain) she would succeed. 她确信自己会成功。/ I'm not sure (certain) where they are. 我不能肯定他们在哪里。也可以说：I'm not sure (certain) how to complete the mission. 我不知道怎样完成这项任务。但不可以说：It is sure that. . . ，此时可以使用 It is certain that. . . 的结构。如：It is certain that she will pass the examination. 她肯定会考及格。/ It is not certain whether or not the total mass of the atmosphere experiences a net gain or net loss. 现在还不能肯定大气总量是否在净增或净减。