Write two of sentences, each one containing introductory and internal participial phrases.Example: My father's hair, streaked with gray and...

Lets first start by remembering that a particple phrase is
always used as an adjective and is uses an -ing verb or a past tense verb form to
start.  In your example sentence, the words streaked and receding are the participles
that introduce the rest of the phrase (and illustrate both types of verb forms that can
be used.)

Here are a couple more examples of each.  First
are two that use an introductory participle phrase to modify the subject of the sentece
that immediately follows the phrase.

Ex.  Running wildly
for the bus, Susie barely made it on time.

Ex.  Shredded
beyond repair, the jeans finally had to be replaced.

Here
are couple of examples of the phrase coming in the middle of the sentence (internal
example).

Ex. Susie, running wildly, jumped on the bus at
the last minute.

Ex. The jeans, shredded at the knees and
faded, had to be replaced.

The value of learning about
participle phrases is that they can easily be used to make your writing more interesting
and your sentence patterns more varied.  Your descriptive language can have a place of
prominance at the start of the sentence, or can be regarded as less essential when it is
set off with commas in the middle of a sentence.  You can combine both to create an
interesting and complex thought.