What is syntactically the -ing-phrase in both the versions with and without the preposition? For example in He has trouble [in] keeping things in perspective right now.
Secondly, does the latter derive form the former?
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.
Sign up to join this communityWhat is syntactically the -ing-phrase in both the versions with and without the preposition? For example in He has trouble [in] keeping things in perspective right now.
Secondly, does the latter derive form the former?
There is no real difference. The omission of prepositions in modifying phrases is and has been common in English:
He lived there [for] several years.
Kiplng L 108 I shall always be threepence short in my accounts = I shall always be short in my accounts by threepence
Gissing G 197 she blames herself no end = she blames herself without an end.
Darwin L 1.209 I can hardly think there will be a coronation [at] this time [in] fifty years.
Thus we have
keeping things - gerund phrase acting adjectivally
in keeping things - Adjectival prepositional modifier (in + gerund phrase.)
Examples taken from "A Modern English Grammar on Historical Principles Part7 Syntax V4 1949 by O Jespersen.