7. Slang is always vulgar, as it is an affected way of talking.
8. We keep the pores of the skin open, for through them the blood throws
off its impurities.
9. Since the breath contains poisonous carbonic acid, wise people ventilate
their sleeping rooms.
10. Sea-bathing is the most healthful kind of washing, as it combines fresh
air and vigorous exercise with its other benefits.
11. Wheat is the most valuable of grains because bread is made from its
flour.
The +adverb clause+ may express +evidence+.
12. God was angry with the children of Israel, for he overthrew them in the
wilderness.
13. Tobacco and the potato are American products, since Raleigh found them
here.
14. It rained last night, because the ground is wet this morning.
15. We Americans must all be cuckoos, for we build our homes in the nests
of other birds.
* * * * *
LESSON 65.
ADVERB CLAUSE-CONTINUED.
+Introductory Hints+.--_If it rains, the ground will be wet_. The adverb
clause, introduced by _if_, assigns what, if it occurs, will be the cause
of the ground's being wet, but, as here expressed, is only a +Condition+
ready to become a cause.
_He takes exercise that he may get well_. The adverb clause, introduced by
_that_, assigns the cause or the motive or the +Purpose+ of his exercising.
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