Comma After That Is Why
That is why looks like a conjunctive adverb or an introductory phrase that must always be followed by a comma, but it is not.
Here is the full list of conjunctive adverbs provided by the YourDictionary online reference:
|
Conjunctive Adverbs |
|
|---|---|
|
accordingly |
additionally |
|
also |
anyway |
|
besides |
certainly |
|
comparatively |
consequently |
|
conversely |
elsewhere |
|
equally |
finally |
|
further |
furthermore |
|
hence |
henceforth |
|
however |
in addition |
|
in comparison |
in contrast |
|
incidentally |
indeed |
|
instead |
likewise |
|
meanwhile |
moreover |
|
namely |
nevertheless |
|
next |
nonetheless |
|
now |
otherwise |
|
rather |
similarly |
|
still |
subsequently |
|
then |
thereafter |
|
therefore |
thus |
|
undoubtedly |
yet |