English: What did you do last weekend?
Czenglish: We were on our cottage.
English: Do you mean you were on the roof of your cottage all weekend?!
English: Don’t worry, it’s a common mistake. You should say you went to your cottage.
This is just like saying, ‘I went to the cinema’.
Be careful when you using ‘on’ to explain your location as well. Normally you should use ‘in’.
For example, ‘I am in Karlin’, ‘I live in Kobilysy’, and, ‘I work in Pankrac’.