U.S.A. 係一句句子最後面,洗唔洗加FULL STOP, WHY?

我諗發問者唔係問USA駛唔駛加 full stops (periods)喺每一個大寫字母之後，而係問究竟 I love U.S.A. 定係 I love U.S.A.. 先至正確。
下文摘自 Wikipedia:
The period is used after abbreviations, such as Mrs. & Ms. If the abbreviation is ending a declaratory sentence an additional full stop is not needed (e.g. My name is Phil Simpson Jr.), but in the case of an interrogative or exclamatory sentence a question or exclamation mark is needed.
根據上面的理論，U.S.A. 係一句句子最後面，就唔洗用兩個 full stop作結尾。
但我就同樣的問題 (是 etc.，不是U.S.A.)，問過英國人(载卓爾夫人之幕僚長 Mr. Powell)、美國人、澳洲人、中國籍英語教師。只可說眾說紛紜，但以須要多加 full stop 之答案居多。
要加的理據不外乎是前面的 full stop 屬 abbrevation 的部份，而後面的 full stop 才是句子的完結。
而不加的理據是為免累贅。
誰是誰非，似乎並無公論。
我的習慣是 如abbreviation 是句子最後一個字，之後再添一個 full stop。But I do not have a strong opinion on those with only one full stop.
What about "," or other punctuation marks?
If an abbreviation should be followed by a comma, then no omission is allowed. Likewise, if an abbreviation is followed by an punctuation mark other then a full stop, then no omission is allowed.

2007-01-15 16:32:46 補充：
至於abbreviations是否有 full stops after every capital letter，則 depends，看習慣及 British England 與 American English 的分別。由於這問題不是針對這事，在此不贅，不然就離題。

2007-01-15 16:40:35 補充：
From http://www.grammar-monster.com/lessons/labbrev.htm:If a sentence ends with the full stop from an abbreviation, then that full stop will suffice. There is no need to put two.

2007-01-15 16:44:48 補充：
After reveiwing more websites, I have found out that most grammaists prefer not to use two but one full stop when a sentence ends with an abbreviation.

為了令你更容易明白，看以下:

要加 I come from USA .

唔需要加 I come from U.S.A .

那你應該知道了!

We usually write abbreviations with upper case in British English.

In fact, we can omit to write full stops at the end.

我們通常在英式英語中以大楷字母來寫簡稱 (abbreviations)，

而句號 (full stops) 其實可以省略。

For example 例如:

The USA can be also written as The U.S.A.

The USA 也可以寫成 The U.S.A. (美國)

2007-01-15 15:44:25 補充：
In Addition, we should add an article 'the' before the abbreviation of the United States of America. We should write its abbreviation as 'the USA'.

We usually write abbreviations without full stops in British English.
Mr, Ltd, Kg, the USA, the BBC
We usually write abbreviations with full stops in British English.
e.g., etc. Dec.

NO NEED!!!

基 本 上 USA 中 間 係 唔 洗 加 點 既

如 果 加 既 , 你 可 以 諗 :
15th Jan. , 2007

同 :
I love U.S.A. .

再 唔 明 send e-mail 去 [email protected] 問 我 !