This is tougher without context but I'll give it a go.
"As we were saying"
"While we were saying"
These two are very similar but as we were saying implies that something happened which may or may not have interrupted what we were saying, while implies that it continued throughout what they were saying, or the action that comes next was completed during what was being said.
"Although we were saying"
"Even though we were saying"
Again, very similar to each other, but different to the last two. This time something happens despite what we were saying. First implies that something happened whilst we were trying to explain something. Second implies that whatever happened was actually contrary to what we were saying.
Can't be bothered with doing all the rest.
"As we were saying"
"While we were saying"
These two are very similar but as we were saying implies that something happened which may or may not have interrupted what we were saying, while implies that it continued throughout what they were saying, or the action that comes next was completed during what was being said.
"Although we were saying"
"Even though we were saying"
Again, very similar to each other, but different to the last two. This time something happens despite what we were saying. First implies that something happened whilst we were trying to explain something. Second implies that whatever happened was actually contrary to what we were saying.
Can't be bothered with doing all the rest.
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