二、哪些单词不能大写首字母？1. 字母少于5个的介词和连词，我来为大家科普一下关于公共英语教材课后题答案?下面希望有你要的答案，我们一起来看看吧!
公共英语教材课后题答案
二、哪些单词不能大写首字母？
1. 字母少于5个的介词和连词。
介词举例：at, down, for, from
连词举例：and, as, but, for, if
2. 冠词：a, an, the 。
3. to（即使是作为不定式出现）。
三、常用虚词分类汇总
如果有些小伙伴仍然感觉拿捏不清，别担心，下面小站把常用虚词做个汇总，分成两列，请收藏本文，随时需要随时翻开查阅即可。
大写：About, Above, Across, After, Against, Along, Although, Among, Around, Because, Before, Behind, Below, Beneath, Beside, Between, During, Except, Inside, Outside, Since, Through, Toward, Under, Underneath, Unless, Until, Whenever, Where, Whereas, Wherever, While, Within, Without
小写：a, an, and, as, as if, as long as, at, but, by, even if, for, from, if, if only, in, into, like, near, now that, nor, of, off, on, on top of, once, onto, or, out of, over, past, so, so that, than, that, the, till, to, up, upon, with, when, yet
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