I've been scratching my head about this for a while now. I'm the kind of person that takes out unneeded words, and can the 'then' in "and then" be omitted? Here's an example. "Aeria drank from the water fountain, and then went to the classroom." Could it be reduced to "Aeria drank from the water fountain, and went to the classroom." I was wondering if it the 'then' was needed to show something being done in sequence or if the reader already imagines it being done in sequence.