What’s the swabi in this sentence ? mr. smithers realized he was a great singer while he was doing karaoke at my birthday party .

The SWABI is while.

EXPLANATION: SWABI is a grammar acronym that helps remember subordinating conjunctions:
 - since, when, although, because, if

- BUT ALSO: after, although, as long as, before, even if, even though, if in, once, since, so that, though, unless, until, whenever, wherever, while.

Iam thinking feelings and action