1 Please pass me that (scissors).
As I know "pair of scissors" and "scissors" are both correct to use. But in this sentences book has replaced "scissors" with "pair of scissors". Can you please explain why so? I have one more doubt whether we use article here "a pair of scissors" or just "pair of scissors".
Thank you
Scissors is plural, like trousers, and that must be followed by a singular. The sentence can be made grammatically correct in two ways: by adding pair of (because a pair is singular), or by replacing that by its plural, those.
Please pass me that pair of scissors
Please pass me those scissors
These are both grammatically correct but, as this Ngram shows, the second version is a lot more common.
Scissors, information, software, and trousers etc. are collective nouns and they don't have any plural form. Now, how to make them 'single?' as in your case? Then, you need to quantify them by adding a few words.
scissors can be quantified as: a pair of scissors.
trousers (--- as above ---)
information ca be quantified as a pierce of information
This is the reason of that replacement.
You surely need an article but in your case, it is following 'that,' so it goes without the article:
Pass me that pair of scissors
"Scissors" consist of a pair of metal blades pivoted so that the sharpened edges slide against each other when the handles opposite to the pivot are closed.
You can call the two-bladed cutting tool simply scissors or you can call it a pair of scissors neither will be wrong. However, if you refer to one unit, you should refer to it as "pair of scissors". If there are more that one then refer to them as "two pairs of scissors", "three pairs of scissors", etc.
Notice the difference in usage:
