Заполните пропуски в ниже диалоге, используя can, could и be able to: john: you ski? dave: yes, i i went skiing last year and i go down the learner’s slope easily. john: i ski when i was younger but since i hurt my leg i dave: actually, i think ice-skating is much easier. i ice-skating when i was five years old. john: really? i tried ice-skating once, i stand up at all.