relating to the form of a verb that tells when the action takes place
According to Duden – Die Grammatik, the frequency distribution of tenses in written German is as follows.
52 % present (Präsens)
38 % preterite (Präteritum)
5.5 % perfect (Perfekt)
3.2 % pluperfect (Plusquamperfekt)
1.5 % future (Futur I)
0.3 % future perfect (Futur II)