A cup of coffee (1) / is an excellent complement (2) / to smoked salmon (3) / no error (4)
According to me error should be in 3 as it should be" a smoked salmon "but the answer provided is no error. Is the answer provided wrong?
A cup of coffee (1) / is an excellent complement (2) / to smoked salmon (3) / no error (4)
According to me error should be in 3 as it should be" a smoked salmon "but the answer provided is no error. Is the answer provided wrong?
There are several ways to use complement.
A is a complement to B.
A is a complement of B.
A complements B.
Unfortunately you have to memorize these and recognize them when they appear.
Your answer would be correct if the subject were plural, and if the sentence didn't include the "to be" verb before "excellent complement". For example:
Many glasses of wine nicely complement a heartfelt conversation.
As written the "to be" verb turns "complement" into a noun:
Many glasses of wine are a nice complement to a heartfelt conversation.
Additionally, "smoked salmon" is both a countable and an uncountable noun. You can have both a single smoked salmon (the whole fish) or some quantity of smoked salmon. Which is meant depends on context, but in general you'll see the uncountable far more often, since you'll rarely want to serve an entire smoked salmon (unless you really like the stuff). In your example question, I would assume they mean an undefined and uncountable quantity of smoked salmon, and not use any article. Related example:
I will never turn down smoked salmon (uncountable) and cream cheese (uncountable) on a bagel (countable).
Personally I don't see coffee going with smoked salmon, but that's just my opinion. I should try it and find out.
(Edit) In my opinion, coffee and smoked salmon are not complementary flavors. However, it may be that coffee is a nice way to cleanse the palate between bites of salmon.
What is the problem?
A cup of coffee - I think no problem with this.
salmon is a countable noun but as a dish, it is uncountable or a mass noun
something can be a complement to something (def: 3)
No error! :)
Assuming the quote is supposed to be a complete English sentence, the error lies in region (3). The words are fine (disregarding the whole business of whether coffee complements salmon), but there should be a full stop (period) or exclamation mark etc at the end of the sentence.
Incidentally, no article is required before salmon. This holds for the coffee as well - you could drop "A cup of" and still end up with a valid sentence, provided you punctuate the end of the sentence.