проверьте пожалуйста 4 предложения правильно ли они составлены?  1 if i found

проверьте пожалуйста 4 предложения верно ли они составлены?

1 if i found a wallet in the street, I would find the owner

2 if saw a UFO in the park, I would removed it on video

3 if I were your friend, I would ring every day

4 if I lost my way in a city, I would look at a card

5 If I saw a big dog, I would stroke it