Usage of the
1 – When both the speaker and listener know
We use the when we believe the reader or person we are speaking to knows what we are referring to.
The moon is very bright tonight.
The cat sat on the window ledge.
The clock showed midnight.
2 – Only one
Use the when there is only one of those things in that place.
Mum can I borrow the car?
The Queen is coming to the hospital.
The moon goes around the Earth.
3 – Already mentioned
Use the when we have already mentioned the thing we are talking about.
An unknown cat was sitting next to the window when I came in. As I went to sit on the sofa the cat had got there first and was sitting comfortably in my spot.
4 – General statements
Use the to make general statements:
The English weather is terrible
The noses of elephants are very long.
The footballers of today are amazing.