"werden" means "to become". And it builds the future. And the passive. OMG. Today, we'll find out all about it. Also: 'become' and 'bekommen' explained :).
Vocabulary trainers often group their stuff by categories. Well, here's one of mine: word for rotten food and the effect it can have on us when we eat it :)
faulen, schimmeln, ranzig, sauer, schlecht, gammeln, kotzen, sich übergeben, ablaufen