lexical root to which one or more affixes are attached. Most Tamil affixes are suffixes. Tamil suffixes can be derivational suffixes, which either change the part of speech of the word or its meaning, or inflectional suffixes, which mark categories such as person, number, mood, tense, etc. There is no absolute limit on the length and extent of agglutination, which can lead to long words with many suffixes, which would require several words or a sentence in English. To give an example, the word pōkamuṭiyātavarkaḷukkāka (போகமுடியாதவர்களுக்காக) means "for the sake of those who cannot go" and consists of the following morphemes: Morphology Tamil nouns (and pronouns) are classified into two super-classes ()—the "rational" (), and the "irrational" ()—which include a total of five classes (pāl, which literally means "gender"). Humans and deities are classified as "rational", and all other nouns (animals, objects, abstract nouns) are classified as irrational. The "rational" nouns and pronouns belong to one of three classes (pāl)—masculine singular, feminine singular, and rational plural. The "irrational" nouns and pronouns belong to one of two classes: irrational singular and irrational plural. The pāl is often indicated through suffixes. The plural form for rational nouns may be used as an honorific, gender-neutral, singular form. Suffixes are used to perform the functions of cases or postpositions. Traditional grammarians tried to group the various suffixes into eight cases corresponding to the cases used in Sanskrit. These were the nominative, accusative, dative, sociative, genitive, instrumental, locative, and ablative. Modern grammarians argue that this classification is artificial, and that Tamil usage is best understood if each suffix or combination of suffixes is seen as marking a separate case. Tamil nouns can take one of four prefixes: i, a, u, and e which are functionally equivalent to the demonstratives in English. For example, the word vazhi (வழி) meaning "way" can take these to produce ivvazhi (இவ்வழி) "this way", avvazhi (அவ்வழி) "that way", uvvazhi (உவ்வழி) "the medial way" and evvazhi (எவ்வழி) "which way". Tamil verbs are also inflected through the use of suffixes. A typical Tamil verb form will have a number of suffixes, which show person, number, mood, tense, and voice. Person and number are indicated by suffixing the oblique case of the relevant pronoun. The suffixes to indicate tenses and voice are formed from grammatical particles, which are added to the stem. Tamil has two voices. The first indicates that the subject of the