You are right.
Student or Learner
Let us say that I am in a shop and see a pair of trousers. Then I want to learn the price so I ask, showing the trousers:
- How much is this/are these?
Which one is OK? Trousers is considered plural so I should use "these"?
You are right.
In British English "How much is this/are these?" is just an abbreviation of the full sentence, which related to your question would be "How much are these trousers?". This tells you that you need "How much are these?". You don't need to say "trousers" simply because in this case you are holding them.
If you were pointing to something which was across the shop from you, you would have to use "that/those" instead.
For items you are holding, or those very near to you:
"How much is this [pen]?"
"How much are these [apples]?"
For items further away to which you have to point:
"How much is that [pen]?"
"How much are those [trousers]?"
If, when you are pointing the person doesn't understand, you may have to be more specific by saying something different and adding any extra detail to help the person understand.
A. "How much are those?"
B. "Sorry, those what?"
A. "Those black trousers over there."
B. "They're only £139.99 because they're on offer."
A. "Hmm. I don't think I shall be buying those today, but thank you anyway."
(BrE first language speaker.)
hi there. i just wanna say thank you cuz this good explain.
sorry if i made mistake im beginner by the way
Last edited by Rover_KE; 20-Aug-2015 at 08:40. Reason: Deleting unnecessary quote.
Welcome to the forum, ehamed.
Eckaslike's post was indeed excellent, but you didn't need to quote it and make us read it all again.
Start every sentence with a capital letter and end it with the correct punctuation mark.
Capitalise the pronoun 'I' at all times.
Don't use texting abbreviations like 'wanna' and 'cuz'.