I used to swim twice a week when I had 12.
I (didn´t or not?) used to smoke so much, but now yes.
I´d visit my grandmother on (a?) Tuesday morning when I arrived to my village.
I´m used to going to the swimming-pool after lunch in (the?) summer.
He (doesn´t / isn´t?) used to eating with chopsticks.
I´m getting used to the hot climate.
He couldn´t get used to playing the guitar with his eyes closed.