I wish I could play the piano.
I usually get to work on foot and then come home on the bus.
The dove is a symbol of peace in any different cultures.
Simon is probably the best rugby player in the county.
The universe is nearly 14 billion years old.
A: I'm reading a great book at the moment. B: Really? What's the book about?
Excuse me, where's the bathroom?
There is only one in the context
There is only one
It refers to a musical instrument
It is with a superlative adjective
It has been already mentioned
It refers to a whole group of things
It refers to a system or service