It is common for learners of English to confuse 'there', 'their' and 'they're' especially since they all have the same sound when being pronounced. Here is an explanation of each one:
'There' has the opposite meaning of 'here'. It is used to mean 'not a place close to' the speaker.
Have you seen mu glasses?
Yes, over 'there', on the table.
I'm driving to work. I'll call you when I get 'there'.
Put your coat 'there' on the hanger.
'There is', 'there are' are used to talk about something that is occurring or that exists somewhere else.
There is a traffic jam on the motorway.
There is a dog on your lawn.
'Their' is a possessive adjective just like 'my', 'your' or 'his/her/its'. It is used before a noun and means that something belongs to the people mentioned before.
John and Sarah have just moved to a house by the sea. That's their house, next to the sushi restaurant.
Peter and David are very pleased with their exam results.
'They're' is a contraction of 'they are'. 'They' is the subject of the verb 'to be'; They are = They're
Did you like the roses?
They're beautiful.
Peter and Tess are on their way here. They're coming by car.
Complete the following with either 'there', 'their' or 'they're':