This section is made up of a number of model sentences. One or two words in each sentence are underscored. Below each group will be found a series of isolated words. The drill consists in substituting these words, one by one, for the one that is underscored in the model sentence, and making necessary changes in the rest of the sentence.

The instructor says the model sentence out loud, and the class repeats after him. The first student makes the first substitution, the next student the second, and so on. Repeat until all students have had a chance to make each substitution at least once, then proceed to the next model sentence.

This drill may be done with books closed. The instructor then gives the students the item to be substituted. Keep things moving along. Maintain a lively pace. If one student gets stuck, the next one takes over after three or four seconds.