1) except means "except …, (also)", which is equivalent to except. For example:
Besides English, they also study math, physics and chemistry.
Besides English, they also study math, physics and chemistry.
Note: Don't confuse except and except. Beside means "beside".
2) except means "except", which is often used with all, every, no, none, nothing and other words with overall positive or negative meanings.
Except is one of the few prepositions with the most active usage in English. Besides nouns (pronouns), it can also be used with another prepositional phrase, infinitive phrase or that-led clause. For example:
He answered all the questions except the last one.
He answered all the questions except the last one.
I went nowhere except to the library. I didn't go anywhere except the library.
Try to compare:
We all went except him. We all went except him.
The other three people also went to the best of him. Besides him, three people went.
[Note] The difference between ]except and except for
Except for also means "except …", but unlike except, the whole word used with except and the words after except are often of the same kind, which means that a part has been removed from the whole; The whole word used with except for is usually different from the word after except for, which means removing a detail from the whole. For example:
Your composition is very good except for a few spelling mistakes.
Your composition is very good except for a few spelling mistakes.
Except for an old lady, the bus is empty. This bus is empty except for an old lady.
3) In addition to meaning "except ...", according to the difference between the above and the following, it can be used as well, except and besides. For example:
I have no one to talk to except them. (= Except)
I have no one to talk to except them.
Apart from other considerations, time is also a factor. (= In addition)
Time is also a factor among other considerations.
Apart from a few minor faults, this is a good work. (= Except)
Apart from some minor shortcomings, this is a good work.