"While I was worried are these two" contains an adverbial clause and the predicate for the subject that was said before. Including the subject is necessary to understand what follows. The complete sentence is:
- Two more English phrases that I thought about last week while I was worried are these two.
The main clause is: Two more English phrases are these two. (The speaker then mentions the two phrases he uses to express worry.)
Inside the subject, there is a relative clause "that I thought about last week while I was worried," which in turn contains the adverbial clause "while I was worried."
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