#1 and #3 are not possible. "kept watch" is possible, but it does not mean the same as "kept watching". Note that "watch" is a noun there.
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pructusHe tried to worship idols and to keep attack.It doesn't make any sense.
pructusNo. "keep", if it takes a verb, always takes a verb in the -ing form.DoesDo the sentences belowmean like thishave these meanings?
pructusMaybe the writer employed some kind of analogy from "keep watch"?In that case, the meaning of keep attack would be to have attacking intention in mind and always find reason to attack?I found the source of the quote on Google Books. The book in question is utter drivel, but it does seem to be written in largely correct English. Glancing through instanc