Grammar lessons you might want to do (i.e. things you’ll assume your students will know and they won’t. Try doing one a day, right at the start of class). Explain the rule, then do an example, then have the students “help” you with an example. Andrea Lunsford’s The Everyday Writer is a great resource for this
Then vs. than
Comma splices
Semicolons
Every day vs. every day
Cite/sight/site
Its and it’s
Making possessives when plural
Bias/biased
Affect/effect
A studentà they (pronoun agreement)
Sentence fragments
Fused/run-on sentences
When to put a comma before “and”
Putting punctuation in relation to quotation marks and parentheses
Colons
Dashes
Capitalization of academic subjects
Who and whom
Misplaced and ambiguous modifiers
Brackets
Active vs. passive voice