Nikifanya mazoezi ya chemia, dada yangu ananisaidia kuelewa majaribio ya fizikia.

Nikifanya is made of several parts:

• ni- = I (1st person singular subject marker)
• -ki- = a special marker meaning when / while / whenever
• -fanya = do
• -a = final vowel of the verb

So Nikifanya mazoezi ya chemia literally means “When I do chemistry exercises / While I’m doing chemistry exercises.”

The -ki- form usually introduces a dependent clause of time or condition: when/whenever/while (I) do…

Both can mean “when I do”, but there are small differences:

• Nikifanya

  • Uses the -ki- marker.
  • Very common in spoken and written Swahili.
  • Often sounds slightly more informal/natural in everyday speech.

• Ninapofanya

  • Built from nina- (I do / I am doing) + -po- (time/place marker) + fanya.
  • Also means “when I do / whenever I do.”
  • Can sound a bit more formal or explicit.

In most everyday contexts, Nikifanya and Ninapofanya are interchangeable in meaning here.