English Grammar - Prepositions of time and place I will start my course on June .[incorrect] I will start my course in June . [correct] I am going in London next year. [incorrect] I am going to London next year. [correct] We use in with a year , month or part of the day , but on with a day or date : I came to Australia in 1988 . His birthday is in August . We'll have the meeting in the afternoon. We arrived on Thursday 1st October . Christmas Day is on December 25 . (= date) We use at with a time and with the weekend and night : Lets meet at the weekend . Are you free on Sunday at 8:00 ? I usually study late at night . We use for to talk about a length of time: I have lived in Australia for 18 years . The meeting lasted for 3 hours - it was too long. We use in with cities , countries and places to say where something is or happened: I met my husband in London . My best friend lives in Switzerland . We were in the park when the fire started. W