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Examples I have seen are

> 例文を作りにくいです。

> なぜ大人になると友達を作りにくいのか？

I thought にくい transforms verbs into a イ形容詞.
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2021-08-17T16:11:00.263
88948
2021-08-26T01:19:38.707
45598
question
grammar
Why is を used with 作りにくい？
にくい can transform both verbs _and verb phrases_ into _difficult to ..._.

  * 例文を作りにくい = (例文を作る) + にくい : It is difficult to make sample sentences.
  * 友達を作りにくい = (友達を作る) + にくい : It is difficult to make friends.

Here **を** is used because 友達 is an object of the predicate 作る, and にくい makes
the whole verb phrases into adjectives.

What you had in mind were probably

  * 例文は作りにくい = 例文は + (作る + にくい) : Sample sentences are difficult to make.
  * 友達は作りにくい = 友達は + (作る + にくい) : Friends are difficult to make.

which are also valid (also が instead of は is possible). Here **は(が)** is used
because they are subjects of the sentences.

There is not much difference. The former describes a property of action
(making sentences or friends) and the latter a property of sentences or
friends in terms of making.

**Additional comment**

Usages of は/を/が above are not totally interchangeable, but it should require
another question.
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2021-08-18T09:15:05.340
88956
2021-08-26T01:19:38.707
2021-08-26T01:19:38.707
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88948
answer