🇬🇧 To learn

Present Simple - I learn
Present Continuous - I

am learning
Present Perfect - I have learned/learnt

Past Simple - I learned/learnt
Past Continuous - I was learning
Past Perfect - I had learned/learnt

Future Simple - I will learn
Future Continuous - I will be learning
Future Perfect - I will have learned/learnt

🇺🇸 Learned is more common in American English
🇬🇧 Learnt is more common in British English