These examples can be sorted so that similar usages appear together. Certainly, a dictionary contains examples, but often examples are too few. As above students can be given the concordances but with the key words deleted so that they have to use their grammatical and lexical knowledge to fill the gaps. This can be done as homework, or as a test. Once filled, the concordances then become example sentences.
Many common words have a number of usages and meanings.
Students can be given some concordances of a single word, and told to group them according to usage. Find the rule Rather than tell students a particular rule, students can be given a set of concordances and asked to discover for themselves what rules can be deduced from the evidence. This could be something simple such as discovering that the verb form changes the third person. In addition, this task can be done with more complex patterns such as collocations. With such software it is possible to create quizzes in which students have to fill gaps.