the Icelandic language, determined by the type of verb: Weak verbs Icelandic weak verbs have the following principal parts: It is possible to make the present subjunctive mood (þótt ég borði, "though I eat") from the first principal part (að borða, "to eat"). It is also possible to make the past subjunctive mood (þótt ég borðaði, "though I ate") from the second principal part (ég borðaði, "I ate"). In some other classes of weak verbs without 'a' as the thematic vowel, the present indicative singular undergoes more changes, but they are still to a large extent predictable. Strong verbs Icelandic strong verbs have the following principal parts: It is possible to make the present subjunctive mood (þótt ég finni, "though I find") from the first principal part (að finna, "to find"). It is also possible to make the past subjunctive mood (þótt ég fyndi, "though I found") from the third principal part (við fundum, "we found"). The present singular indicative in this class also undergoes more changes(i-umlaut, dental suffix assimilation etc.), which may let some verbs seem irregular at first glance. They are, however, mainly regular changes, like those in the weak verbs. Preterite-present verb Icelandic Preterite-present verbs have the following principal parts: It is possible to make the present subjunctive mood (þótt ég kunni, "though I knew") from the first principal part (að kunna, "to know"). It is also possible to make the past subjunctive mood (þótt ég kynni, "though I knew") from the third principal part (ég kunni, "I knew"). Ri-verbs Icelandic Ri-verbs have the following principal parts: It is possible to make the present subjunctive mood (þótt ég snúi, "though I turn") from the first principal part (að snúa, "to turn"). It is also possible to make the past subjunctive mood (þótt ég sneri, "though I turned") from the second principal part (ég sneri, "I turned"). Others Spanish Excluding a few highly irregular verbs, in Spanish, verbs are traditionally held to have only one principal part, the infinitive, by which one can classify the verb into one of three conjugation paradigms (according to the ending of the infinitive, which may be -ar, -er or -ir). However, some scholars believe that the conjugation could be regularized by adding another principal part to vowel-alternating verbs, which shows the alternation. For example, herir "to hurt" is usually considered irregular because its conjugation contains forms like hiero "I hurt", hieres "you