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The book was so advanced that even graduates in the discipline found it difficult.

Is the above sentence correct ? My book says I need to add to understand after difficult because when difficult used for predicative purpose it is usually followed by to + Verb first form. Is it true ? Isn't the above sentence correct without to understand ?

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    The sentence is fine as is. It might have been difficult to tear in half too, but advanced sets the semantic scope. – Tᴚoɯɐuo Sep 1 '17 at 19:06
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Grammatically it is not necessary to add to understand.

For comprehension, it could be, but there is enough context in the sentence, it probably doesn't matter.

If you care about the difference between these sentences:

The book was so advanced that even graduates in the discipline found it difficult to understand.

The book was so advanced that even graduates in the discipline found it difficult to read.

The book was so advanced that even graduates in the discipline found it difficult to finish.

Then it would be helpful to add on the verb.


Contrast with a shorter sentence:

Graduates in the discipline found the book difficult.

Here, there is less context, and therefore a little more ambiguity.

Are the graduate students trying to pick up the heavy book?

Graduates in the discipline found the book difficult to lift.

Are they trying to stop reading the exciting book?

Graduates in the discipline found the book difficult to put down.

Are they embarrassed because it reflects poorly on their field of study?

Graduates in the discipline found the book difficult to defend.

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The book was so advanced that even graduates in the discipline found it difficult.
The book was so advanced that even graduates in the discipline found it difficult to understand.

The two sentences are grammatically correct.

The to+verb form in the second one serves as an adjective complement in order to clarify (meaning) what was the sort of difficulty that graduates found in the book; ....it difficult to understand or to read, for example.

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