3. "What have I done?" is asked by the knave and the thief.
4. Who was the discoverer of America is not yet fully determined by
historians.
+Explanation+.--The subject clause is here an indirect question. See Lesson
74.
5. When letters were first used is not certainly known.
6. "Where is Abel, thy brother?" smote the ears of the guilty Cain.
7. When to quit business and enjoy their wealth is a problem never solved
by some.
+Explanation+.--_When to quit business and enjoy their wealth_ is an
indirect question. _When to quit business = When they are to quit
business_, or _When they ought to quit business_. Such constructions may be
expanded into clauses, or they may be treated as phrases equivalent to
clauses.
The +noun clause+ may be used as +object complement+.
8. Galileo taught that the earth moves.
that
-------
'
earth | ' moves
------|-------
\the |
|
Galileo | taught | / \
=========|==============
|
+Explanation+.--Here the clause introduced by _that_ is used like a noun as
the object complement of _taught_.
9. The Esquimau feels intuitively that bear's grease and blubber are the
dishes for his table.
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