.. as_ modifies _profitable_, telling the +Degree+ of the quality
expressed by it.
A clause that does the work of an adverb is an +Adverb Clause+.
Analysis.
The +adverb clause+ may express +time+.
1. When pleasure calls, we listen.
we | listen
===|=========
| \
`When
`
pleasure | \ calls
---------|---\-------
|
+Explanation+.--_When_ modifies both _listen_ and _calls_, denoting that
the two acts take place at the same time. It also connects _pleasure
calls_, as an adverb modifier, to _listen_. The offices of the conjunctive
adverb _when_ may be better understood by expanding it into two phrases
thus: We listen _at the time at which_ pleasure calls. _At the time_
modifies _listen_, _at which_ modifies _calls_, and _which_ connects.
The line representing _when_ is made up of three parts to picture these
three offices. The part representing _when_ as a modifier of _calls_ is,
for convenience, placed above its principal line instead of below it.
2. While Louis XIV. reigned, Europe was at war.
3. When my father and my mother forsake me, then ths Lord will take me up.
Lord | will take | me
======|=====================
\The | \up \
..\ then
` \
`
`When
father \
------------'\ \
\my ' \ \
' \ \
' \ | \ forsake | me
'and \----|---------------------
' / |
' /
mother ' /
------------'/
\my
+Explanation+.
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