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the subject is usually a noun phrase, other kinds of phrases (such as gerund phrases) work as well, and some languages allow subjects to be omitted. In the examples below, the subject of the outmost clause simplex is in italics and the subject of boiling is in square brackets. There is clause embedding in the second and third examples.
: [Water] boils at 100 degrees Celsius.
: It is quite interesting that [water] boils at 100 degrees Celsius.
: The fact that [water]

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