1. From. When teaching vocabulary, it is good not just to teach words but to teach clusters of information that will help students to use the words correctly. For example: use a/an when introducing countable nouns (e.g., a theory); use to when introducing verbs (e.g., arrive); show that verbs transitive by adding an indefinite object such as something (to propose something); and use to be when introducing adjectives (e.g., to be naïve). Also indicate any prepositions needed, where relevant (e.g., to be interested in something).