- I find the lesson interesting.

=> I am interested to the lesson.

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These are possible:

I’m **interested in** the lesson.

I find the lesson **interesting**.

This is an interesting lesson.

I have great **interest in** this lesson.

I’m following the lesson with great interest.

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‘Interesting’ is a purely descriptive state and ‘interested’ is the active state -

I am interested in something which is interesting.

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The word **interest** takes the preposition **in** which may be called the *ready-made* preposition as in the examples provided by Torsten and Alan.

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