No one uses the word "Hen", except a small minority. And the minority who do use it are generally so obsessed with it they use it even when the gender is known, for example calling me, a male, hen instead of han, which I find insulting. If it's unsure what gender it is about or if it's a transsexual in question then sure, but it's rude to enforce it on everyone else. If it was just the bold part I wouldn't mind it, but it's not.
Isn't "he" considered gender neutral when no gender is specified?
But frankly, I can't stand seeing "he/she" or "they" for singular pronouns when gender is unknown. And "it" is for objects. I just pick "he" or "she" and move on.
Putin khuliyo
They is not correct, since you can't use a plural to refer to a singular.
You should say "He/she opened the door."
it is also acceptable in some circles to say "He opened the door" even if you have no idea if it is a man or woman. It's similar to how you can open a letter with "Dear sir" as a generic introduction rather than "Dear sir or madam"
---------- Post added 2013-01-08 at 05:54 PM ----------
That is not correct. In your example, it would be "If one should decide to skip class, then one will be docked a full letter grade."
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"However, it is generally regarded as a bad idea to mix the impersonal or generic pronoun one with another pronoun, especially in the same sentence, as in 'If one fails, then he/you must simply try harder.'
http://grammar.ccc.commnet.edu/grammar/one.htm
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Humans are the only species on the planet smart enough to be this stupid.
A quick perusal of the "They (singular)" wiki quoted before shows that it has been in use for a very long time. English doesn't have an institution that dictates what is considered grammatically correct (Académie Française, Real Academia Española, etc.), so unless you're following a style manual/guide, it's hard to say it's categorically wrong.
Not entirely true. While I agree with the general idea, it's not in the English language; it's mainly used by the LGBTQ community. Or rather: The more... Militant groups.
The correct pronoun in the English language is 'They.'
Besides, 'Zhe, Zhim, Zher...' Sorry, but it sounds absolutely ridiculous; something from out of a children's magic book.