Is it better to not add the preposition when using any of the usages below in daily conversation and in writing? Why? Will the answers vary from person to person?

spend time (on) doing something / have no problem (in) doing something / have difficulty (in) doing something / is no point (in) doing something / is no use (in) doing something / Good luck (in) doing something / be busy (in) doing something

  • We usually say "I have no problem with..." and "Good luck with...". "It is no use doing..." is usually used without a preposition. In the other examples, it's optional. I don't know why, that's just the way English is used. – Kate Bunting Jan 20 '20 at 12:04
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    Also, we spend time doing an activity, but spend time on a task or project. – Kate Bunting Jan 20 '20 at 12:07
  • @KateBunting So, you don't often hear people saying "I have no problem doing something" and "Good luck doing something"? – Sam Jan 21 '20 at 5:13
  • Yes, people do say those things, but if a preposition is used it would normally be with and not in. – Kate Bunting Jan 21 '20 at 9:43
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    Yes, as I said in my original comment. – Kate Bunting Jan 22 '20 at 9:05

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