Please check these morphemes' divisions.

1)mice -/mice/ (1)
2)sitting - /sitting/ (1)
3) punches - punch/es (2)
4)runners - /runner/s/ (2)
5)firefighters - fire/fight/ers (3)
6) Automobile - auto/mobile (2)
7)Chart - /chart/ (1)
8)horseshoe - horse/shoe (2)
9)sees - /sees/ (1) I'm not sure if I should take s as another morpheme in this case
10) seeing -see/ing (2)
11)saw - /saw/ (1)
12)saws - /saw/s/ (2)

Be sure you're clear on the differences between morphemes and phonemes:

http://en.wikipedia.org/wiki/Morpheme

http://en.wikipedia.org/wiki/Phoneme

1. correct
2. incorrect
3. correct
4. correct number, but incorrect division
5. correct
6. correct, I think
7. correct
8. correct
9. correct ... and I'd not count the final -s separately
10. correct
11. correct
12. incorrect, I think

My professor gave an example: cats - /cat/s /(2 morphemes). And said the s is another morpheme.

Is sitting - sit/ting ?
Is runners - run/ner/s?

With that explanation, then yes, the last ones you listed are right.

Sure! I'll analyze the morphemes and provide the divisions for each word:

1) mice - /mice/ (1)
The morpheme division is straightforward here. The word "mice" consists of a single morpheme.

2) sitting - /sitting/ (1)
Similarly, "sitting" is a single morpheme.

3) punches - punch/es (2)
The word "punches" can be divided into two morphemes: "punch" and "-es." The "-es" suffix is used to indicate the plural form.

4) runners - /runner/s/ (2)
Similar to the previous example, "runners" can be divided into "runner" and "-s." The "-s" suffix indicates plurality.

5) firefighters - fire/fight/ers (3)
The word "firefighters" can be separated into three morphemes: "fire," "fight," and "-ers." The "-ers" suffix is added to indicate people who perform the action of fighting fire.

6) Automobile - auto/mobile (2)
The word "Automobile" can be divided into "auto" and "mobile." Both parts contribute to the overall meaning of the word.

7) Chart - /chart/ (1)
The word "Chart" consists of a single morpheme.

8) horseshoe - horse/shoe (2)
The word "horseshoe" can be split into "horse" and "shoe." Each part carries its own meaning.

9) sees - /sees/ (1)
In this case, "sees" is a single morpheme.

10) seeing - see/ing (2)
The word "seeing" can be divided into the verb form "see" and the suffix "-ing."

11) saw - /saw/ (1)
The word "saw" is a single morpheme.

12) saws - /saw/s/ (2)
Lastly, "saws" can be divided into "saw" and "-s." The "-s" is added to show plurality.

It's important to note that morpheme divisions can sometimes be subjective and context-dependent. However, this analysis provides a general understanding of the morphemes in each given word.