However, it sometimes translates to the verb ‘to be’, or it is found in expressions where completely different verbs are used in English. Common expressions using avoir include: ...
There are two main classes of verbs in English: strong and weak ... There is one verb that is irregular and weak in the past tense, but strong in the the non-progressive participle: do, did, done. A ...
So, in IKIMASU (to go), you change KI to KU, and get IKU. There are two irregular verbs that don’t fit the above patterns. They are KIMASU (to come), and SHIMASU (to do). KIMASU becomes KURU ...