Hi,
I think there are many conjunctive adverbs and some are noted here. But what baffles me the use of a comma before certain conjunctive adverbs and tag what looks to be parenthetical phrases. I feel only certain conjunctive adverbs are allowed? to have such a structure, whereas most of them don't. Why is that?
Some tidbits from the New York Times Search:
1. ... no longer self-supporting, hence the decision to end it.
2. Here in Denver, for example, ridership was up 8 percent ...
3. ... could lead to a less-stringent step, namely requiring selllers to ...
4. ...admitted that the collaboration unforeseen events, namely a sudden gaping hole in the main-stage season.
5. ... make a decision on what to do with Rivers and thus, challenged ...
If you look at no. 5, it has the conjunction 'an' and 'thus' comes after it. I feel most, if not all, conjunctive adverbs can acustom themselves to this type of structure, but no. 1 though 4 seem to have one more way to avail themselves apart from most other conjunctive adverbs. Why it that? What do I habve to do to learn to punctuate and write properly?