One day, about a year after Tom had retired, when I stayed/was staying (оба варианта верны) with Tom's brother, he said: “Let's go and see old Tom I haven't seen him for a long time. He will be happy to see us”. When we came up to his place. Tom was sitting outside the oldcarriage which he had got as a present on his retirement, smoking his pipe in the heavy rain “Why on earth you are sitting there? Why don't you go inside the carriage out of the rain?" "But it's a non-smoking carriage,” he answered.
I usually say "Hello", "Goodbye" or "See you later".
But when I speak with my parents, friends and etc.,
I always use No formal style of speaking,
It's like "Hi", "Bye" and etc.
Удачи.