Dear native English speakers. The following are 6 sentences with which I want to express the same ideas, but I have no confidence to determine whether they are grammatically correct or whether they have the same meaning.
1. He was as worried as she was, and talking very fast.
2. He was as worried as she was, and he was as worried as she was, talking very fast.
3. He was as worried as she was, and that talking very fast.
4. He was as worried as she was, and talking very fast at that.
5. He was as worried as she was, —— talking very fast at that.
Question:
Which is grammatically correct?
Do they all have the same meaning?