Grammatical competence refers to the ability to recognise the syntactical features of a language and to use them to interpret and produce words and sentences. It also incorporates receptive and productive knowledge of the lexical, morphological, and
phonological aspects of the language.
Guided discovery is any inductive teaching approach where rather than the teacher just telling students the rules, the learners are provided with examples and encouraged to work out the rules governing them for themselves.
In language teaching this entails giving examples of a specific language item. The teacher will usually devise some specific tasks for the students to do to guide them in the right direction.
Most of the activities on the tenses in Unit 4, Part 3 of this course are examples of guided discovery.