This fifth book in the series introduces short vowel sounds
and r-influenced vowels.
These sounds are the most difficult for newcomers to distinguish,
and thus have been delayed until students have been listening to
English for a period of time. Many of the words are recycled from
earlier books, where the focus was on the consonants, so the
students will have heard and seen the full spellings of the words
before. Now students are ready to distinguish the vowel sounds. By Elizabeth Claire