us
-------
| \to
\ | \ know | faults
\For | \------'--------
\ / \ \our
\-------
|
/ \ | is \ profitable
=============|======================
|
+Explanation+.--_For_ introduces the subject phrase; the principal part of
the entire phrase is _us to know our faults;_ the principal word is _us_,
which is modified by the phrase _to know our faults_.
5. God never made his work for man to mend.
+Explanation+.---The principal term of the phrase _for man to mend_ is not
_man_, but _man to mend_.
6. For a man to be proud of his learning is the greatest ignorance.
The +infinitive phrase+ may be used as an +explanatory modifier.+
7. It is easy to find fault.
\to
\ find | fault
\-----'------
|
It (/ \) | is \ easy
=========|===========
|
+Explanation+.--The infinitive phrase _to find fault_ explains the subject
_it_. Read the sentence without _it_, and you will see the real nature of
the phrase. This use of _it_ as a substitute for the real subject is a very
common idiom of our language. It allows the real subject to follow the
verb, and thus gives the sentence balance of parts.
8.
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