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He found the truth revealed in a letter.

He found the truth is revealed in a letter.

1. A man arrested for robbery pleads innocence.

2. A man is arrested for robbery and pleads innocence.


Why does is not work in 1 but is necessarily in 2. I can see logically it requires the is but the meaning is exactly the same in both.


Why is the verb is optional in the first example also ? Why do some sentences work with or without them?

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Let's just discuss your first examples.

He found the truth revealed in a letter. The main idea here is that the found the truth.

He found the truth is revealed in a letter. The main idea here is that he found the fact that the truth is revealed in a letter.


. . . the meaning is exactly the same in both. No, the meaning is different. See my comments above.