Page:Adapting and Writing Language Lessons.pdf/413

CHAPTER 8 Obviously, and  stand respectively for the names of men and women known to the students.

Substitution—correlation drills lend themselves to practice of gender—number concords, as in the above example, to matching tenses of verbs with appropriate time expressions, to matching prepositions with the nouns, verbs or adjectives in a sentence, and so forth. Some important relationships, however, cannot be drilled in this way. For these relationships, transformation drills are needed.

The purpose of this drill is of course to practice the single relationship which unites with went, buy with, with  and  with.

A different kind of transformation drill combines two short sentences into a longer one: