English nouns with only a plural form

source: Crown Academy of English     2017年11月21日
Certain English nouns only have a plural form. Their form is always plural, never singular.
There are 3 types of nouns where the form is always plural:
1) Certain articles of clothing.
trousers
knickers
pyjamas
shorts
tights
pants
Example: I like your trousers.

2) Certain tools or instruments.
headphones
scissors
sunglasses
binoculars
glasses
Examples: Can I borrow your headphones?

We use the following structure for ONE unit (singular) of the clothes and tools previously mentioned:
"pair of" + noun
Example: I need a pair of shorts.

We use the following structure for several units (plural):
"pairs of" + noun
Example: I am going to buy 3 pairs of scissors.

3) Other nouns with only a plural form
belongings
Example: "Do not leave your belongings in the classroom."
savings
Example: "I spent my savings on a new car."
clothes
Example: "His clothes are dirty."
stairs
Example: To go to the first floor, you can take the stairs.

Parts of speech: https://www.youtube.com/watch?v=FDbhU...
Past simple: https://www.youtube.com/watch?v=0Ri3Q...
Past perfect: https://www.youtube.com/watch?v=EZopc...
How to improve your English: http://www.youtube.com/playlist?list=...
Grammar: http://www.youtube.com/playlist?list=...
Listening practice: http://www.youtube.com/playlist?list=...
Vocabulary: http://www.youtube.com/playlist?list=...