您好，这是英语中可数名词的重要用法之一:
teacher是可数名词，根据上文中he为单数，teacher应该用单数形式，这时就要加a。
再如，“他经常读书。”He often read a book.
教师的英文单词：teacher
英 [ti:t(r)] 美 [tit]
第三人称复数：teachers
名词 教师，教员，老师，先生; [航]教练机
情景对话
生活对话
A：Huh? I cant hear you over this music.
什么?这音乐太大声，我听不见你说什么。
B：Can I move closer to you?
我可以靠你近一点吗?
A：Mmmm, sure.
嗯，……好啊。
B：Rose, I really miss our piano lessons.
柔丝，我很怀念我们的钢琴课。
A：I could help you find a teacher in Hsinchu...
我可以帮你找新竹的老师……
B：Well, Id like you to be my teacher. I miss you, Rose.
我希望你当我的老师。我想念你，柔丝。
A：Oh, I miss you too.
我也想念你。
教师的英文单词：mentor
英 [ment:(r)] 美 [ment:r]
第三人称单数：mentors第三人称复数：mentors现在分词：mentoring过去分词：mentored过去式：mentored
有经验可信赖的顾问;做…的良师;指导;
1. She insists on my self-reliance and independence, so shes given me enough space and freedom to face difficulties squarely and try to overcome them on my own during my growth period. though, shes undereducated when shes young and was a common workwoman, in my opinion, shes the greatest mentor.
她坚持我要成为独立自主、自力更生的人，所以，在我的成长过程中，她总是给我足够的空间和自由让我自己正式困难，并独自解决它们。虽然，她从小未受到良好的教育，也只是一名平凡的女工，但在我的眼中，母亲是我最伟大的导师。
2. Who are you? - Im his mentor.
我是他的导师
3. I really appreciate my mentors help.
我很感激我的启蒙老师。
4. I like to be a mentor because it gives me the opportunity to help new employees develop.
我希望成为一名导师，因为那样我会有很多的机会来帮助新员工的发展。
5. I dont think i need you as my mentor anymore.
我不再需要你做我的指导师了
6. Then I talk to my mentor, who is also my 3 physics modules tutor, her advise is I can think for another half year, and now do major only.
回来看到新路了，她从意大利回来，呵呵，真的真的.很高兴看到她的时候，在HQ门口看到她，真的很高兴，我也不知道为什么那么高兴，想来还是最看重她了，跑起来像个小木偶，然后跑过来和我拥抱，真的很高兴啊，感觉很亲切阿。
7. Mentee`s focus on the learning of teaching and classroom management varies along with the mentor`s experience.
实习教师对於教学及级务实习的学习重点，会随著实习辅导教师的辅导经验有所不同。
8. He has made a good attempt at matching, even upstaging, his political mentor.
然而，在安倍上任的头一个月--他戏称，感觉像是过了一年--就在赶上甚至超越其政治导师方面，做出了很好的尝试。
9. If he or she is not, you have the wrong mentor and/or project.
如果他/她不是这样，你就选择了一个错误的导师或者错误的课题。
教师的英文单词：schoolteacher
英 [sku:lti:t(r)] 美 [skultit]
第三人称复数：schoolteachers
名词 (中、小学的)教师
1. When he returns with his hostages to his native village, he and the local ruling schoolteacher have a go-around on how the town is to be run.
当他带着人质回到家乡山村时，与当地的管理者学校教师关于小镇走向何方发生了争论。
2. All my life I had lived in the quiet little village of Essendean, in the Lowlands of Scotland, where my father had been the dominie, or schoolteacher.
我一直生活在苏格兰低地的埃森丁这个安静的小村庄里。我的父亲曾经是那儿的教师。
3. She was a schoolteacher, so we had very little money.
她是老师，所以我们也没什麼钱
4. He is my stereotype of a schoolteacher.
他是我心目中的典型老师。
5. He is a schoolteacher who started the festival and continues to promote it.
他是这个节日的发起人，现在仍在推广这个节日。
6. Because I chose to be a schoolteacher.
因为我选择了当中学老师。
7. Im a schoolteacher and I have to save every cent I can.
我是名教员，我不得不精打细算。
8. His father john was the county treasurer, and his mother Olivia was a schoolteacher.
他的父亲约翰是县司库，他的母亲奥利维亚是一个教师。
9. Neill was born in Forfar, the son of a schoolteacher.
尼尔出生于Forfa，是一个老师的儿子。
男老师 man teacher男老师（复） mem teachers女老师 woman teacher女老师（复） womem teachers
以两个名词构成的复合名词(前面的名词为man或woman除外)，一般把后面的名词变复数。 ? 如：boy friend→boy friends, paper bag→paper bags。?
而当man, woman, gentleman和其它名词构成复合词时，其单复数以所修饰的名词的单复数而定，也就是说：如果变复数，两个词一起变复数。 ? 如：men workers ?women teachers ? gentlemen officials