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In older Japanese the Te Form and the plain past Ta Form (you can make the latter, just by changing -e to -a) used to follow be made by adding -te and -ta to the stem of the verb (what is left when you remove -masu).


DictionaryMasuTe Form
taberu 'eat'tabemasutabete
miru 'see'mimasumite
hanasu 'speak'hanashimasuhanashite

For U Verbs, however, with Dictionary Forms ending in other letters, various contractions have taken place.

U Verbs ending in the nasal consonants bbu, m mu and n nu end up with -nde:

DictionaryMasuTe Form

yobu 'call'

yomu 'read'yomimasuyonde
shinu 'die'shinimasushinde

Note that 死ぬ Shinu 'die' is the only verb in modern Japanese ending in -nu. Often it is replaced by euphemisms such as 亡くなる naku naru lit. 'become nothing, disappear' in polite speech.

In many situations With verbs ending in -u, -ru or -tsu, we end up with -tte:

DictionaryMasuTe Form  
kau 'buy'kaimasukatte
kawaru '(sth) changes'kawarimasukawatte
matsu 'wait'machimasumatte

With verbs ending in -ku or gu, the k or g in the stem drops, but the g has enough strength to turn -te to -de:

DictionaryMasuTe Form
kaku 'write'kakimasukaite
kagu 'smell (sth)'kagimasukaide

All verbs with the consonants mentioned follow these rules, as we would expect である de aru, する suru and 来る kuru are irregular:

DictionaryMasuTe Form
de arudesude

行く Iku 'go' is also irregular in this one form: itte

言う Iu 'say' (pronounced yuu) is also irregular; also: itte