What is the difference between 没 and 不 when used with 又?
A. 他又没来上课;
B. 他又不来上课
These two sentences are showing different feeling of the speaker. Sentence A is describing a rather objective fact: He had been absent from class often, and he was absent once again today. It may translate to &quot;he doesn't show up the class again.&quot;
The sentence B is spoken with a tone of condemnation beside describing the same fact in sentence A. The words &quot;不来上课&quot; indicate an extra meaning that he was absent from class without reasons or on purpose. It may tranlate to &quot;he doesn't want to show up the class again.&quot;
Both sentences can be ended with &quot;了&quot; to have an emphasizing tone, simply trying to attract more attention of the audience. Without &quot;了&quot;, it is a rather flat tone. The translation is &quot;he doesn't (want to) show up the class, once again.&quot;