Imperfect Tense Third Person Active?

Greek Learning Greek
1

The imperfect tense third person active just has a blank “–” in the chart. Does that mean that I just write
the stem or use the regular third person ending, ει?

2

The chart, for anyone answering.

3

You have to add the appropriate theme vowel—omicron or epsilon—before the personal endings, as you can see from the chart. Omicron in 1sing&pl and 3pl, epsilon in 2sing&pl and 3sing.
In the impf, 3sing active has no personal ending following the epsilon theme vowel, but it does have an optional nu.
The chart should make it all clear.

4

May I ask from which book this chart came?

5

Introduction to Attic Greek By Donald J. Mastronade. But it looks slightly different in the second edition I have. Joel can confirm where he got it from.