TYPICAL ERROR Blake and rebecca are going to sydney.
CORRECTION Blake and Rebecca are going to Sydney.
EXPLANATION Names and titles such as Blake, Rebecca, Sydney, Australia Day and Labour Day should each begin with a capital letter because they are actual names given to individual people, places and occasions (so we call them proper nouns).
While using lower-case letters may be fine when we are quickly typing in internet chat rooms and other informal situations, it is important to be able to be precise in formal situations.
Here are some more examples:
Austria, Brisbane, Cradle Mountain, Dr Chan, Fortescue Metals, Hume Highway, Kangaroo Island, Kwai-Ho, Lake Argyle, Martin Place, Monday, Prime Minister, Queen Street, Toyota, Uluru, The Great Wall of China
Rewrite these sentences using capitals where appropriate. (The number of capitals required for each sentence is indicated.)