1. Arrive at and arrive in:
We arrived at my friend's house
The train arrived at the station
I arrived in London
Specific place = at
City or country = in
Don't say: we arrived to my friend's house etc
2. At night
You do things AT night
We are going out at night etc
Do not say: I am going out in the night or I work in the night
Beware: IN the morning, IN the afternoon but AT night
3.looking FOR and Waiting FOR
I'm looking for my glasses
I'm waiting FOR her etc
4. For (period of time)
I have been working here FOR five years
I have been living here FOR three months
Since = specific point in time e.g. Last September, last week
I have been studying in America SINCE February etc
5. Months and years = IN
My birthday is IN July
She was born IN 2004
Do not say my birthday is ON July etc
6. Live/work/study IN a city or country
Live/work/study AT a specific address or company or college etc
E.g. I live IN Shanghai and work FOR the Bank of China
7. Days and dates = ON
My birthday is ON Saturday
8. It depends ON something
9. Welcome TO somewhere
10. Married TO someone
Any questions? Ask me!