Fugue 11 in F Major, BWV 856

This piece begins in the key of F major (as it states in the name). The subject lasts until m. 4 and is stated two more times besides the initial statement. Therefore, this fugue is made up of three voices. I found that the subject is in this piece 14 times. I'm having a hard time figuring out where exactly the cadences are, but I definitely feel cadences at measures 13, 46, 56, and of course the last measure. The expository section obviously starts at the beginning of the piece and lasts until m. 30. The modulatory section is from m. 30-65. I'm not sure if this is correct, but it seems to finally get back to the original key at m. 66.