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Sometimes we use spend like "spend something on doing something" but sometimes we are using without on like "I spend a lot of time working on this project". Is there any difference between these usages? If yes, what is the difference? Thank you for your help.

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In those situations, on is optional.

But use on no more than once:

  • Right: I spent a lot of time working on this project.
  • Right: I spent a lot of time on this project.
  • Wrong: I spent a lot of time on working on this project.

Sth is not a word.

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    I spent time working.... (here working is an adv.). 'I spent time on working' makes 'working' a verbal noun.
    – Ram Pillai
    Mar 27 '20 at 12:23
  • . .. so Right: I spent a lot of time on reading. Mar 27 '20 at 14:02

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