Real English ESL - Lesson 46 - So Did Mark

What did Liz and Mark do yesterday?
1. They worked.
2. Liz worked and Mark watched TV.
3. Mark worked and Liz watched TV.
What are Mark's exact words? What does he say exactly?
1. So did I.
2. So was I.
3. So am I.

Lesson 46 - So Did Mark - Exercise 16