Why it has this rule?

[Barb_D]

Regarding point 1b, the government has said no such thing. Societal norms determine what is acceptable and what is not, and in which situations, not the government!

[sumon.]

I would like to give some examples of verb forms of Bengali language.(Because I feel(ing) very interested)
As I said most of the verbs have two parts. We only change the second part.
Suppose 'simple' is a noun , we will make it verbs adding a verb('do', it is the second part). ( proper example would be 'addition do' as 'simple' is an adjective)
So the verb will be "simple do" in Bengali but 'simplify' in English.
We also make verbs adding the verb 'do' with adjectives. For example, make something nice
= nice do.
Ha ha.. isn't it interesting?
We like our verb forms. So I think languages are really interesting and complicated systems of communicating with each other.

[5jj]

(ii) Shakespeare had one of his characters say: "the town is beseech'd, and the trumpet call (instead of calls) us to the breach."

Indeed, but Shakespeare was presenting an Irish character, (one who possibly spoke English as a foreign language) whose speech was non-standard in many ways, as we see in the rest of the speech, here

[bhaisahab]

For an Irish person in the 17th century, English would have almost certainly been a foreign language.

[5jj]

y(IMHO, of course!) the greatest grammarian who has ever lived (and who will ever live): Professor George Oliver Curme.

Hmmm. There have been a lot of grammarians over the last three thousand years, including, to name but a tiny handful, Aristotle, Dionysius Thrax, Jacob Grimm, Otto Jespersen, Kamta Prasad Guru, Kātyāyana, Lancelot & Arnauld, Priscian, Randolph Quirk, Henry Sweet, Ali Taramakhi, not to mention Chomsky, Halliday, Quirk, ...

[Suthipong]

Thank you to all. I never give up studying English.