Final answer:
The corrected form is 'professors'' with an apostrophe after the 's' to show plural possession as the lectures belong to multiple professors. Accurate subject-verb agreement and proper use of punctuation are crucial in writing. The corrected sentence: 'After lunch, Dory always has trouble staying awake for the professors' lectures.'
Step-by-step explanation:
The phrase in question should be corrected to indicate the possessive form of the plural noun since the lectures belong to the professors. Therefore, the correct form is 'professors' with the apostrophe following the 's' to show plural possession, which makes the corrected sentence: 'After lunch, Dory always has trouble staying awake for the professors' lectures.'
In writing, it is essential to ensure subject-verb agreement, and to use singular or plural verbs that fit the context correctly. Collective nouns can be particularly tricky as they can take singular or plural verbs depending on whether the group acts individually or as a unit.
When editing writing, one should also pay close attention to punctuation, such as the use of commas and apostrophes, to avoid documentation errors or mechanical mistakes which are often looked down upon by professors.