My Grandmother used to always say that “Whomever lays down with dogs ends up scaring cats”, but I never understood what that crazy woman meant. (6)
1. “Grandmother” should be lower case.
2. Avoid splitting the infinitive “to say.”
3. Remove either “that” for direct quotation or the quotation marks for paraphrase.
4. The objective case “Whomever” should be the nominative case “Whoever.”
5. The transitive verb “lays” should be the intransitive verb “lies.”
6. The comma should be placed inside the quotation mark.
A corrected version might read
My grandmother always used to say, “Whoever lies down with dogs ends up scaring cats,” but I never understood what that crazy woman meant.