Nouns that always need a plural verb
Some nouns are always followed by plural verbs. Examples are: binoculars, scissors, spectacles, glasses, knickers, pyjamas, trousers etc. Note that it is wrong to say �a binocular� or �a spectacle�. If the singular aspect is to be expressed use the expression �a pair of�. Examples are: a pair of trousers, a pair of glssess etc.
His new glasses were on the table.
The scissors were by the fireplace.
Bring me the knickers that are on the line.
Note that we use a singular verb when the phrase �a pair of� comes before the noun.
Compare:
His new pair of glasses was on the table.
The pair of scissors was by the fireplace.
Bring me the pair of knickers that is on the line.
I hope this helps.