is archaic and encountered only in poetry. All participles have turned into other parts of speech, future and past active participles becoming present and past active adverbial participle respectively, and resultative pariciple becoming past tense of verbs. In Serbo-Croatian the forms jesam, jesi, jeste and so on are used as the basic form of the Present Tense "to be" (i.e. I am, you are etc.), while the forms budem, budeš, bude etc. are used only for the formation of the Future Perfect. In Bulgarian, forms бъда, бъдеш, etc. are not used by themselves but only in compound forms (future ще бъда, subjunctive да бъда). In this respect they closely follow the usage (and non-usage) of perfective verbs. As such it has its own forms for the aorist (бидох, биде, биде, бидохме, бидохте, 'бидоха), the imperfect (бъдех, бъдеше, бъдеше, бъдехме, бъдехте, бъдеха) and the resultative participle (бъдел). Another verb - бивам with fully regular conjugation type III paradigm - completes an aspect triple: imperfective съм, perfective бъда, secondary imperfective бивам. The perfective aorist has lost its original meaning and is now used only to form the compound conditional mood (бих чел = I would read). All participles except the resultative participle (бил) have lost their function and are now used as regular adjectives with changed meanings (същ = same, бивш = previous, ex-, бъдещ = future). Baltic languages In Lithuanian, the paradigm būnu, būni, būna, etc. is not considered archaic or dialectal but rather a special use of the verb būti, to be, mostly used to describe repeated actions or states, or habits. Celtic languages In the Celtic languages there is a distinction between the so-called substantive verb, used when the predicate is an adjective phrase or prepositional phrase, and the so-called copula, used when the predicate is a noun. The conjugation of the Old Irish and Middle Welsh verbs is as follows: The forms of the Old Irish present tense of the substantive verb, as well as Welsh taw, come from the PIE root *stā-. The other forms are from the roots *es- and *bhū-. Welsh mae originally meant "here is" (cf. yma 'here'). Irish and Scottish Gaelic In modern Gaelic, person inflections have almost disappeared, but the negative and interrogative are marked by distinctive forms. In Irish, particularly in the south, person inflections are still very common for the tá/bhí series. The verb bí The copula Gaelic (bh)eil and