CALPERLEX is a series of worksheets that teachers can use in their course to explore language through corpus analysis. Teachers can find single lexical items or contrasting lexical pairs or routine expressions presented in form of concordance lines. The "problem set" can be printed out and used in the classroom. They can also be used by individual learners for self-study.
CALPERLEX on "da ty chto"
CALPERLEX on "ukh ty"