In all of these language groups, reflexive forms often present an obstacle for foreign learners (notably native speakers of English, where the feature is practically absent) due to the variety of uses. Even in languages which contain the feature, it is not always applicable to the same verbs and uses (although a common subset can be generally extracted, as outlined below). For example, the Spanish reflexive construct ""se hundió el barco"" ("the boat sank") has no reflexive equivalent in some Slavic languages (which use an intransitive equivalent of "sink"), though for example Czech and Slovak do use a reflexive verb: "loď se potopila"/"loď sa potopila".