Since ski can be transitive lifts and runs that your instructor determines you are capable of skiing safely is grammatical; it means they determine you can ski the lifts and runs safely. It's still a relative clause, but that refers to the lifts and runs, while when refers to the time when they determine that you can ski (intransitive, no object, just skill level), not to any particular lifts and runs. –
John Lawler
Aug 3, 2021 at 23:24
搜到的,仅供参考 |