A. I was standing at the window, when I had an idea. (while)|
at the windows, an idea.
C. While we were travelling around Europe, we met a Spanish boy. (when)
around Europe, a Spanish boy.
E. We were talking about great inventions when we got to the station. (while)
about great inventions, to the station.
G. We got lost while we were walking in the mountains.
, in the mountains.
I. My parents were listening to music when I got home.
K. While Jane was sitting by the swimming pool, she got a text message.
a text message, by the swimming pool
M. Leonardo was observing some birds when he had the idea.
some birds, the idea.