B. Countable Noun can be a Singular and Plural countable noun:
B1. A Singular Countable Noun cannot be used alone, must have a Determiner: a, an, the, every etc. (e.g. My first plan is to study the English grammar every day.)
B2. A Plural Countable Noun do not have a Determiner when they refer to people or things as a group. (e.g. Computers are very expensive)
B3. Plural noun forms:
a. usually add -'s': book -> books, friend -> friends
b. add -'es' to nouns ending in -ss, -ch, -s, -sh, -x: class -> classes, wish -> wishes
c. when a noun ends in a consonant and -y, we make the plural in -'ies': country -> countries, but boy -> boys, day -> days
e. some common nouns have irregular plurals: woman -> women, child -> children, foot -> feet, person -> people
B4. Two-part nouns are Plural: binoculars, glasses, jeans, knickers, pincers, pants, pliers, pajamas, scissors, shorts, spectacles, tights, trainers, trousers, tweezers (e.g. These binoculars were very expensive.)
a. We can use 'a pair of ~' and, if we want to talk about more than one, we use 'pairs of ~'. (e.g. I need a new pair of spectacles. We’ve got three pairs of scissors, but they are all blunt.)
Today's Idiom:
over the top (OTT): too extreme and not suitable, very expensive
Example: I thought the decorations were way over the top.