For the sentence #1 and #2, one might make the insertions shown in parentheses: 1. When (she was) questioned, she denied being a member of the group. (quoted by A student's Grammar of the English Language)
Q1) Can I take off "when" too?; "Questioned, she denied being a member of the group."
For the sentence #1 and #2, one might make the insertions shown in parentheses: 1. When (she was) questioned, she denied being a member of the group. (quoted by A student's Grammar of the English Language) Yes
Q1) Can I take off "when" too?; "Questioned, she denied bei
Such 'short-form' clauses are not typical of casual English. That means even if sentence may be wordy, it's better to say a subject in a surbordinate clause one more time in spoken English? e.g., "Whenshe was questioned, she denied being a member of the group" rather than "Whenquestioned(or just ques