When I want to say ‘This is Jonas’s pen’. Do I use ‘s’s’?

Yes, you do use “s’s” to show possession for names ending in “s.” So, the correct way to say it is “This is Jonas’s pen.”

Written by Al Mahbub Khan Full-Stack Developer & Adobe Certified Magento Developer

Full-stack developer at Scylla Technologies (USA), working remotely from Bangladesh. Adobe Certified Magento Developer.