Should I say focus in or focus on. In which situations is better to use one over the other.

I need to focus on/in quality issues.

  • Welcome to ELL! It depends what you want to say, ti could be either. Would you have some example sentences? It would make it easier for answerers. – Peter Jan 8 '17 at 3:19

You use the preposition "on", not "in", after the verb "focus" when you give a lot of or particular attention to somebody or something,

So the correct sentence is:

I need to focus on quality issues.

  • Yes, focus on,but people also say: to focus in on something. – Lambie Feb 11 '19 at 14:35

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