Определите, какую грамматическую функцию выполняют окончания –s (-es). 1. when they watch television commercials, they discover that there are thousands of things they or their parents could buy. 2. in the role of consumer, a person buys goods and services for personal use, not for resale. 3. consumer goods are products, such as food, clothing, and cars, that satisfy people's economic needs or wants. 4. a producer makes the goods or provides the services that consumers use. 5. a person who makes lemonade and then sells it is producing goods.

1.    
When they watch television
commer­cial, they discover that there are thousand of
things(mnojestvennoe ceslo) they or their parents( mnojestvennoe ceslo) could buy.

2.    
In the role of consumer, a person buys(present simple) goods (mnojestvennoe ceslo)and
services(mnojestvennoe ceslo)  for personal use, not for resale.

3.    
Consumer goods are products(mnojestvennoe ceslo) , such as food, clothing,
and cars(mnojestvennoe ceslo) , that sat­isfy people's economic
needs(present simple) or wants(present simple).

4.    
A producer makes (present simple)the goods( mnojestvennoe ceslo)or
provides (present simple)the services(mnojestvennoe ceslo)  that consumers( mnojestvennoe ceslo)use.

5.    
A person who makes(present simple) lemonade and
then sells(present simple) it is producing goods(mnojestvennoe ceslo).