It is/ be/ was/ were because?

就針對問題而言，只可以選it is because。
Yes, if I were her father, I would help her. It is/ be/ was/ were because she were my precious child.
以上所有underline的部份為past tense，因為均帶有假設性成份。
至於句中的it xxxx because，是要introduce an explanation of cause and effect，並沒有任何「假設性」。所以寫成it is because。

此外，在中文我們常有這樣的句子結構：「我做出了xxx的決定 - 因為，xxxx（原因）」。反觀英文則不常常這樣表達，不因為這樣說不對，而是這樣的句子結構在英文來說不甚「成熟」（多年前hkslot的英文老師曾這樣說）。就以上句子而言，只需說「…because…」也就足夠了（正如發問者所言）：
Yes, if I were her father, I would help her just because she was so precious to me. (NOT “she were”)


另外，It is because亦較為常見於一句statement之開始：
It is because your ego was hurted.
It is because he no longer fears.
It is because workers today produce far more than those in the past.

2010-02-11 15:02:46 補充：
according to henry's further question 少許補充：
she was so precious to me. (NOT “she were”) <---
應該說 she was so precious to me 與 she were so precious to me 同樣正確.

2010-02-11 15:03:07 補充：
"was" and "were" both suggest the subjeutive mood in old-school english.
But you can use "were" to denote its HYPOTHETICAL nature, as what this link explains.

http://www.wsu.edu/~brians/errors/were.html

Thanks for your question.

2010-02-11 15:04:41 補充：
subjunctive mood <-- :)

沒有 it be.
IT WAS係過去式,不合理，用來強調過去?
IT WERE不應用假設語吧
我會用IT IS


同埋個SHE WERE MY precious child.


我個人覺得都應用翻SHE IS因為後面成句都係講個人意見或原因。

以上未必係正確，純屬個人之意見,可參考不可盡信因此不要插我。
但希望呢個問題會水磊石出。

If you were her father, would you help her? Why?

Yes, if I were her father, I would help her. It is because she would be my precious child.



XXXXXXXXXXXXXXXXXXXXXxx

If I were her father.......
This is talking about something now. So one should use (It is because....)

I think using (would be) is better. The reason is as follows:
If I were her father, she would be my precious child.

You do not say:
If I were her father, she were my precious child.

is，因為你根本係佢老豆，係事實，同埋我上面個個有D野錯咗，如果一D野係沒可能發生係要用were

2010-02-09 19:52:41 補充：
HENRY，你自相矛盾，因為如果係沒可能發生先用were，如果係真嘅話，唔會用were

第一，你開頭的句子中「If you were her father」已經錯了，這裡應該用 was 而非 were。

第二，你問的問題的答案是 was，因為你不是她的父親。

第三，because she were...應用 was。