兩句有咩分別?

1. (其實你應該寫 "He's a nice guy that I've ever seen."。)
第一句means 這位人兄是我見過所有人中最好人的。
第二句means 這位人兄是我從來未見過的好人。
2. It 的眾數形是"They"。
3. 可以，因為冇人話過they唔可以用喺死物上。
例︰They are my pets and they're called "Tom" and "Paul".


請參考:http://en.wikipedia.org/wiki/It_(pronoun)

兩句都有問題:

1) 係想講: 他是我見過的人當中最好的! 正確寫法應該係:

He is the nicest guy I have ever seen.

2) 係想講: 我從沒見過像他那樣好的人! 正確寫法應該為:

I have never seen a guy as nice as him.

It 的眾數當然都係 They

2010-02-05 16:11:15 補充：
hkslot 寫道: Plural form也有用these的情況：

Singular：It is the car I have mentioned.
Plural：These are the cars I have mentioned.

我認為 These 應該係 This 的 plural form, 這個例子的 singular 應該是 This is the car I have mentioned. 用 It 的話意思上未完整, 只能夠係一個 clause.

hkslot's answer to 1 is correct.

2 is not English. It is Chinglish, often seen in secondary school composition.

The grammatical correction made by hkslot is still wrong.

合文意只能：
I have never seen this guy before.
我從未見過這個人。

不能有nice唔nice的任何形容。never是「從未或從沒」，英語邏輯上不能「無中生有」地知道這個從未見過的人是好是壞。

hkslot's answer is very good.

你應該是問“I have ever seen”與“I have never seen”的分別吧。
I have ever seen = 在我見過之中…
I have never seen = 我從沒有見過…

你提出的兩句，同樣犯了文法上與意義上的謬誤，皆不對。
第一句意思，應是「他是我見過之中最好的人」，應寫成：
He is the nicest guy I have ever seen.
第二句則更含糊，是否可以理解成「他是個好人，我從沒見過他」或「我從沒見過他這個好人」？如是，應分別寫成：
He is a nice guy that I have never seen him before. 及
I have never seen this nice guy before.

另外，一般情況下，it的眾數是they：
Singular：The tree is green. It is a pine tree.
Plural：The trees are green. They are pine trees.
Plural form也有用these的情況：
Singular：It is the car I have mentioned.Plural：These are the cars I have mentioned.

2010-02-03 16:16:30 補充：
It’s illogical to describe the nature of someone / something when you havent seen it before.
But I advise uplevel2046 - 不要一本通書睇到老。It’s not always the matter about “syntax of Englsih language”.

2010-02-03 16:16:43 補充：
See these:
Sara: “I had never seen such nice beach before!”
Alex: “I've never seen Angelina look sexier in any role before.”
有冇人可以回答，直至Sara或Alex講完說話的一刻，他們有否看過“such a nice beach”或“a sexier Angelina”？

第一句：佢係我見過最ＮＩＣＥ既人；
第二句：我從未見過好似佢咁ＮＩＣＥ既人；
最後，ＩＴ既眾數都係ＴＨＥＹ；

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it's actually really simple
da 1st sentence is the 1 dat we used most commonly
like : "this is the gayest shit I've ever heard."
never use never, seriously i havent seen any1 used never b4

第一句係曾經見過
第二句係從未見過
It既眾數係they

第二句係錯的。

It 的眾數是 they