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Focus on fields in which you can become good at.

vs

Focus on fields that you can become good at.

Melissa
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    Does this answer your question? [When to use 'which' or 'in which' or 'that' (as relative pronouns)?](https://ell.stackexchange.com/questions/14591/when-to-use-which-or-in-which-or-that-as-relative-pronouns) If the answer there seems a bit too technical, have a look at [that / in which / in that / which](https://ell.stackexchange.com/questions/27366/that-in-which-in-that-which) – FumbleFingers Jan 13 '21 at 18:44

1 Answers1

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The second sentence is grammatical and idiomatic as it is written. The first is not, because it has a double preposition. The first sentence becomes grammatical if you drop the final "at".

Focus on fields in which you can become good.

Jack O'Flaherty
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    Well spotted! I missed the extraneous ***at*** in OP's first example. I doubt that was intended though - probably just what happens when you're doing cut&paste in a foreign language. StoneyB's excellent answer in the linked "duplicate" goes into the syntactic implications of preposition placement in these contexts though. – FumbleFingers Jan 13 '21 at 18:48