Was ist der Unterschied zwischen 'to mutter' und 'to murmur' ?Du kannst auch einfach Beispielsätze geben.

"Mutter" and "murmur" are both used when someone speaks quietly.

"Mutter" suggests a negative emotion.
For example, if you feel very grumpy, you "mutter" when you speak. If you write that a person "mutters", the reader knows the person feels angry/in a bad mood.
e.g.
1. "Hello," she said.
"The weather is so cold," he muttered.
2. "How are you?" he asked.
"My boss has given me too much work," she muttered.

A common phrase is "to mutter under his/her/your/my/their breath". This is when you say something very quietly, because you do not want anyone to hear. It is usually also something negative.
e.g.
1. "Look at that ugly hat," he muttered under his breath.
2. "I don't trust this man," she muttered under her breath.
3. He was obviously in a bad mood, because he kept muttering under his breath.

"Murmur" is a soft, cute sound.
e.g.
She murmured in her sleep.

"Murmur" also means to say something quietly, but the speaker can be feeling any emotion.
If someone "murmurs", they can be difficult to understand because they are speaking so softly and quietly.
e.g.
1. The teacher was talking, so my friend murmured a reply.
2. He was embarrassed. He murmured "thank you" and left the restaurant.
3. She was very shy, and murmured her response.

I hope that helps!