Questions & Answers about Der Löwe ist stärker als der Affe.
Why do we use als here instead of wie?
We use als (than) because this is a comparison where two things are unequal. You will always see als after a comparative adjective like stärker (stronger). If the lion and monkey were equally strong, we would use so ... wie (as ... as): Der Löwe ist so stark wie der Affe.
Why does stärker have an umlaut when the basic word is stark?
Many short, one-syllable adjectives with an a, o, or u add an umlaut when they change into their comparative form. To make stark (strong) mean "stronger", you add -er to the end and an umlaut to the vowel: stärker.
Why is it der Affe and not den Affen?
The word after als (or wie) takes the same grammatical case as the thing it is being compared to. Since der Löwe is the subject of the sentence (nominative case), der Affe must also be in the nominative case. In English, people sometimes say "stronger than him", but German always strictly matches the cases.
Aren't Löwe and Affe both "weak nouns" that usually get an -n at the end?