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 |