shonakshi wrote:
Can sum1 pls explain what is the difference between the use of which and [,which] ?
is it not that [,which] is for the whole sentence before the comma and which is for the word before which ?
No, the point you made is applicable for present participle (verb-ing) modifiers only.
"Which" is a relative pronoun, and therefore must refer to a noun antecedent; "which" can NEVER refer to a clause.
(You may find the following post about present participle modifiers useful:
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