Le troisième groupe as it's called in French contains the most complex and the most difficult verb conjugations in the French language. The main reason for this is that verbs belonging to that group are irregular (i.e. irregular stems and/or endings)

The third group is considered extinct. Newly-coined French verbs are now listed under the 1st  group (-er verbs) or 2nd group (-ir-verbs).

There are a little over 350 French verbs in the third group.

Le troisième group comprises

• the verb aller
• verbs ending in -ir whose present participle ends in -ant (not -issant)
• all verbs ending in -oir
• all verbs ending in -re

 

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Let's conjugate a couple of verbs in the third group:

VENIR (present tense)

je viens, tu viens, il vient, nous venons, vous venez, ils viennent

CROIRE (present tense)

je crois, tu crois, il croit, nous croyons, vous croyez, ils croient

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