Should I study all of them or I can just use any of them in different case? I am talking about other more verbs which has same meaning but differ in context ..
closed as off-topic by Robert, πάντα ῥεῖ, Stephie, Björn Friedrich, Philipp Jan 4 at 10:01
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The main meaning of erhalten and bekommen is the same (to receive), they just have different niveaus of language (erhalten being the high-level and bekommen the mid-level one). There is a third word kriegen that should only be used in informal speech.
Both words, however, have a secondary meaning. Erhalten can mean to preserve, bekommen can mean to agree in the meaning of "that food agrees with me".
Vollbringen on the other hand has absolutely nothing to do with the other words, it means to accomplish.