However, there's a rule that governs this change:
The "y" changes to "i" only if it is preceded by a consonant.
In "convey," the "y" is preceded by the vowel "e." Therefore, the "y" remains unchanged when adding the suffix "-ed."
Here's a simple way to remember:
* Consonant + y + suffix = Change y to i (e.g., "carry" + "-ed" = "carried")
* Vowel + y + suffix = Keep the y (e.g., "convey" + "-ed" = "conveyed")
Let me know if you have any other spelling questions!