"Learn verb forms as you go" or "Learn verb forms on the fly" are both phrases that can be used to describe the process of learning verb forms as you are using them in a sentence or conversation. In other words, you are learning verb forms as you need them, rather than studying them in advance or in a structured manner.

For example:

"I'm not great at verb forms, but I'm trying to learn them as I go."

"I'm still learning Engpsh, so I sometimes have to figure out verb forms on the fly."

"I find it helpful to learn verb forms as I go, because it helps me remember them better."

I hope this helps! Let me know if you have any other questions.