Diagnostiquer belong to the 1st group. Diagnostiquer is a common french verb.
Diagnostiquer is conjugated the same way that verbs that end in : -er
Diagnostiquer is conjugated with auxiliary avoir.
Diagnostiquer verb is
direct transitive. Diagnostiquer verb is a direct transitive verb, so passive voice can be used.
Diagnostiquer is conjugated the same way that verbs that end in : -er.
First group verbs always end with -er as their infinitive. Endings of first group verbs are regular. Note : Although endings are perfectly regular, spelling changes occur in the stems of verbs in -cer, -ger, -yer, -eter, -eler, -é-consonne(s)-er, -e-consonne-er, verb envoyer and similar verbs.