on

في \ a; an; each; every: twice a day; 80 miles an hour. at: (showing where): at home; at the office, (showing a point of time) at midday; at 4 o’clock; He was married at 18, (after an adj) good at English; quick at sums. by: during: We travelled by night. in: showing where: In bed; in London; in the box; in his speech, showing condition In a hurry; in trouble, showing a direction; into He fell in the river. He put his hand in his pocket, showing when; during In the past; in January 1980; in the evening, showing what sth. contains or includes There are 60 minutes in an hour. Is he in your team?, showing what sb. wears He was in his best suit, showing a shape or arrangement They stood in a row, showing employment or activity or an event He’s in the navy. She was killed in the accident. on: showing when: on Monday; on May the 6th. showing the state of sb.:: Are you here on business or on holiday?. per: for each: He earns $8000 per annum (for each year).