done". Past tense of the adjectival verbs (powinienem był zrobić "I should have done") and conditional mood (zrobiłbym był "I would have done") are often wrongly considered pluperfect forms – morphologically, the latter is actually past conditional, rarely used in modern Polish. In Serbo-Croatian, the pluperfect ("pluskvamperfekt") is constructed with the past tense ("perfekt") of the verb to be ("biti") plus the adjective form of the main verb. For example: "Ja sam bio učio", which means, "I had been studying". In Bulgarian, the pluperfect (минало предварително време) is formed with the imperfect tense of the auxiliary verb съм (to be) and the perfect active participle of the main verb. Other languages In Welsh, the pluperfect is formed without an auxiliary verb, usually by interpolating -as- before the simple past ending: parhasem, "we had remained". In Irish, perfect forms are constructed using the idea of being (or having been) after doing something. In the pluperfect, bhíomar tar éis imeacht, "we had gone", literally, "we were after going". In Finnish, the pluperfect (pluskvamperfekti) is constructed with an auxiliary verb olla 'to be', which is in the past tense. The primary verbs get the past participle endings -nyt/-nut in singular, -neet in plural forms (the 'n' assimilates with certain consonants) and -ttu/-tty/-tu/-ty in passive forms. Table of forms Different perfect construction In German and French there is an additional way to construct a pluperfect by doubling the perfect tense particles. This is called doubled perfect (doppeltes Perfekt) or super perfect (Superperfekt) in German and plus past perfect (temps surcomposé) in French. These forms are not commonly used in written language and they are not taught in school. Both languages allow to construct a past tense with a modal verb (like English "to have", in German "haben", in French "avoir"), for example "I have heard it". This is largely equivalent to the usage in English. The additional perfect tense is constructed by putting the modal verb ("to have") in the past tense as if being the full verb ("I have had") followed by the actual verb in the past particle mode ("I have had heard it"). The same applies to those verbs which require "to be" (German "sein", French "être") as the modal verb for the construction of the past tense (which would not work in English). In spoken language in Southern Germany the doubled perfect construction sometimes replaces the Standard German pluperfect construction.