Also make sure you use a /z/ sound on the end of the word. Say "sez" /sɛz/, not "s-ay-s" /ses/.
For more help with vowel /ɛ/, go to our practice for vowel /ɛ/.
https://www.speechmodification.com/online-practice-free-trial/how-to-pronounce-vowel-eh
For more help with final /z/ sounds, check out our practice for final /z/.
https://www.speechmodification.com/online-practice-free-trial/smart-video-course-final-z
For more everyday mistakes, see our YouTube playlist and our Quick Fix Practice.