Tu te souviens means "You recall", and so on). 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". Reflexive verbs can have a variety of uses and meanings, which often escape consistent classification. Some language-common identified uses are outlined below. For example, Davies et al. identify 12 uses for Spanish reflexive constructions, while Vinogradov divides Russian reflexive verbs into as many as 16 groups. Martin Haspelmath also has a useful distinction between the reflexive types mentioned below, which he calls introverted reflexives, and so called extroverted reflexives, which are used for verbs that are usually not reflexive, like hate oneself, love oneself, hear oneself, and kill oneself. Some Indo-European languages have a different reflexive morpheme for extroverted reflexives. For example: See how the Russian ненавидеть себя (nenavidet' sebja) "to hate oneself", which uses a reflexive pronoun, compares to мыться (myt'-sja) "to wash (oneself)", which uses a reflexive suffix (Russian can also say мыть себя (myt' sebja), with a reflexive pronoun, but only when the pronoun needs to be stressed for emphasis or contrast). Or Dutch "zij haat zichzelf" "she hates herself", versus "zij wast zich" "she washes (herself)". The distinction exists similarly in English, where introverted reflexive verbs usually have no reflexive pronoun, unlike extroverted. In ancient Greek, the introverted reflexive was expressed using the middle voice rather than a pronoun. Similarly, in modern Greek, it is expressed using the middle usage of the mediopassive voice. On the other hand, the extroverted reflexive was a true reflexive in ancient Greek and modern Greek. Similarly Claire Moyse-Faurie distinguishes between middle and reflexive in Oceanic languages in her on-line articles about reflexives in Oceanic languages. Properly reflexive The "true" (literal) reflexive denotes that the agent is simultaneously the patient. The verb is typically transitive and can be used in non-reflexive meaning as well. Reciprocal "Reciprocal" reflexive