- “Who do we know had a key to the place?”,
- “Do we know who had a key to the place?”
When I came across sentence #1 from ‘the Silkworm,’ I thought #2 would be a possible structure. (If they denote the same sense, I’m not sure.) But when matrix verb were ‘think’, can the second-pattern structure (#4 below) be possible?
- “Who do we think had a key to the place?” (I can see this type in CGEL,p.1082)
- “Do we think who had a key to the place?”
The sentence itself is plausible (you can think a fact, but think a question?) , but the meaning is somewhat strange from #3. Is #4 possible? Possible but not have the same meaning as #3?