"Ik herinner me zijn naam niet."
Translation:I do not remember his name.
Is "me" necessary in this sentence or just useful as an example of a reflexive?
It is necessary. The person you speak to might not notice it if you leave 'me' out, and he will get what you mean anyway, but it doesn't make sense without 'me'.
Why is not 'I myself don't remember his name'? (as it one is stressing that they can't do it).
Because duo's sentence does not imply that there's anything being stressed i guess. Although you can stress the word 'ik' duo would've given a sentence like "Ikzelf herinner me zijn naam niet" "Zelf herinner ik me zijn naam niet"
Next time report it using the green button that is present with the sentence and select "my answer should have been accepted". At this moment I cannot tell what your answer was and if there are possible issues.
Is the "me" part only part of this sentence because the verb is zich herinneren? Are all the verbs in this lesson "zich ___" ?
I am trying to make some sense of when to use these reflexives or see a pattern. They are more looking to be memorization.