+Model+.-- ----_in building a snow fort_. They were engaged _in building a
snow fort_. The participle _building_, like a noun, follows the preposition
_in_, as the principal word in the phrase; and, like a verb, it takes the
object complement _fort_.

---- by foretelling storms. ---- by helping others. ---- on approaching
the house. ----- in catching fish.

Use the following phrases as subjects.

Walking in the garden ----. His writing that letter ----. Breaking a
promise ----.

Use each of the following phrases in a complex sentence. Let some of the
dependent clauses be used as adjectives, and some, as adverbs.

---- in sledges. ---- up the Hudson. ---- down the Rhine. ---- through
the Alps. ---- with snow and ice. ---- into New York Bay. ---- on the
prairie. ---- at Saratoga.

Build a short sentence containing all the parts of speech.

Expand the following simple sentence into twelve sentences.

Astronomy teaches the size, form, nature, and motions of the sun, moon,
and stars.

Contract the following awkward compound sentence into a neat simple
sentence,