Notes

1. We use the before nouns if the reader/listener knows exactly what we mean.
It is used when:
2. We also use the when referring to something in particular and not something in general.
Study these examples.

Particular General
The time I saw Jack he was very happy. I think time goes quickly at the weekend.
The rain last night was so heavy that it kept me awake. I don't like rain, I prefer sunshine.
I don't know much about the geography of China. Geography lessons were interesting at school.

 

3. We often use the when we are referring to a group of things, like :

a group of people
The unemployed are often ignored by society.
a type of instrument or invention
I learnt to play the piano when I was ten.
The internet has become very popular in a short time.
a general kind of place or area
I like the countryside but I've lived in the city all my life.
a kind of animal or plant
The dinosaur has been extinct for millions of years.
The cactus is one of the few plants to survive in the desert.