我们的英语老师25岁，还是单身。

解答：25岁表达：

【1】twenty-five 或者25

【2】twenty-five years old 或者25years old

【3】twenty-five years of age 或者25 years of age

网友以上中文句子可以使用“一般过去时”和“一般现在时”进表达

【1】Our English teacher remained single when she/he was 25 years old.

【2】Our English teacher remained unmarried at the age of 25.

【3】Our English teacher stayed single when he/she was 25 years old

【4】Our English teacher was single when he/she was 25 years of age

【5】Our English teacher was 25 and still single/unmarried.

【6】Being 25 years old, our English teacher was still single.

备注：说话人关心的是过去时间，即说明过去在25岁时候的婚姻状态。

【1】Our English teacher is 25 years old and still stays single

【2】Our English teacher is 25 and still remains single/unmarried

【3】Our English teacher is 25 and still single/unmarried

【4】Our English teacher is 25 years of age and still remains single

【5】Our English teacher is at the age of 25 and still stays single

【6】Being 25 years old, our English teacher is still single/unmarried.

备注：说话人关心的是现在时间，即说明现在25岁时候的婚姻状态。