 Hi, nice to see you again, welcome to you all. As you know, with the search options list and chart, you can perform simple searches to find out how frequently a word is used. The verb, contribute for instance, can be found more than 26000 times. In the concordance lines though, you can see, that contribute is only shown in its exact form. We do not have any information about the frequency of all the members of the paradigm, that is, third person singular, past tense, participle forms and so on. If we are interested in how frequently a word is used including all its inflectional variants, we can apply the lemma search. To do this, you simply type the query in capital letters. As a result, you receive all members of the paradigm, even those that involve irregular or morphographic variants. Select these two examples, go with its inflectional variants, and carry, which involves the Y to I change in some forms. By the way, with lemma searches, even contracted forms are displayed. And if you want to search for contracted forms only, make sure to insert a space before the contracted form, as shown here. Okay, that's enough for now. Don't forget to practice, try as many as possible lemma searches, and see you again soon.