英文 有Comma同冇Comma的分別

依個係英文中relative clause GE "which" GE用法之一,
加左","GE話係修飾成件事,
唔加GE話因為個which 跟住" my dog", 所以就會變左修飾my dog,
或者我咁樣講->

1.She hit me dog, which is merciless.

因為加左"," ... 所以個which係修飾"She hit my(不是me) dog" 依件事,
即係修飾which前面果句野,

咁就係解成->
她打我的狗, 這真是沒人性.

2. She hit my dog which is merciless.


因為佢係修飾前面果個"my dog", 所以解釋上就會變左->

她打我那隻沒同情心的狗.

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簡單D講,

有COMMA GE時候就係修飾前面句句子,
無GE時候就係修飾前面果個字.

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上面五個都解得好詳細，不過猶如文法書理論。

我試從簡易角度解，看看是否會有點用，和對你將來看書和寫作有幫助。

有comma的話，which is之後講/寫的是形容前句全部意思。例如你例句，前句全句是she hit my dog這行為，which is之後說是merciless(冇人性)，用了comma這句子是表達「她的(打狗)行為冇人性」。

冇comma的話，which is之後講/寫的是形容which之前那一樣東西。例如你例句，she hit my dog which is merciless，which之前是dog，所以merciless是形容my dog，意思變成「我隻狗冇人性」。全句意思是「她打我那隻冇人性的狗」。

這用comma在which, that, who, where大致上都差不多作相同的用法，希望你看得明白啦。

1. (She hit my dog), (which is bad)
which reflects her action with comma.

2. She hit my dog which is bad.
which reflects the dog that is bad without comma.

I think it's good to change the adjective a little if you're little unsure how it relates.

1. She hit my dog, which is merciless.
有 comma是因為佢好merciless, 所以打隻狗.

2. She hit my dog which is merciless.
冇 comma 是因為隻狗好merciless, 所以佢打隻狗.

eg1.She hitme dog,which is merciless.

這句有 comma 是解作.......
因為好merciless, 所以佢打我隻狗.
(不是 me dog 是 my dog) 及 (這句 which 是只merciless)

VS

eg 2. She hit my dog which is merciless.
這句沒有 comma 是解作.......
因為隻狗好merciless, 所以佢打我隻狗.
(這句 which 是只隻狗)