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?

Question

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?

Answer

1 and 4 are both grammatically correct. 1 is similar to how someone would say it in a normal everyday conversation, and 4 is a more formal or "old" style. The meaning is similar, but I wouldn't necessarily say "at that" at the end of a sentence unless I was writing a novel or something. It's similar to saying "as well" so wouldn't really fit here. The rest have grammatical errors like repetition or improper punctuation.

1 和 4 的语法都正确。1 的表达方式与日常对话中表达的方式类似，而 4 的表达方式更正式，或者说是“老式”。意思也差不多，但除非我在写小说之类的，否则我不会在句末加上“at that”。它类似于“as well”，所以不太适合用在这里。其余的都存在语法错误，例如重复或标点符号不正确。