Inflected forms of verbs

A typical English verb may have five different inflected forms:
*The base form or plain form (go, write, climb), which has several uses--as an infinitive, imperative, present subjunctive, and present indicative except in the third-person singular
*The -s form (goes, writes, climbs), used as the present indicative in the third-person singular
*The past tense or preterite