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In the Genki textbook, it is said that "In the casual conversational use of
short forms, question sentences do not end with the question particle か, but
with rising intonation alone."

Nonetheless, in the manga I'm reading, it's written 「そろそろいくか」 (meaning "I
should get going" right?).

My thoughts here is that Genki didn't explain the whole context, as I've also
heard this same expression in animes. Could someone clear it up?
CC BY-SA 4.0
2019-02-03T21:46:06.443
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2019-02-04T06:15:58.313
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question
particles syntax colloquial-language manga
か after short forms
The statement is an oversimplification. The ending か tends to be dropped most
of the time, because it makes it sound crude ... not necessarily rude, maybe
possibly. And since fiction has a larger tolerance for more expressive speech,
you'll encounter it more often.

Also when talking to oneself politeness isn't really required, so that's more
permissive.

Ending か also has a special usage in that it can mean a strong rejection (するか!
~ As if/no way I'm gonna do it!)

And embedded questions contain a か following a plain form, since politeness is
expressed by the main verb ... stating just for completeness
CC BY-SA 4.0
2019-02-04T03:23:07.280
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2019-02-04T06:15:58.313
2019-02-04T06:15:58.313
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answer