英语作文中的鼓励性结语可以采用多种表达方式，旨在激励读者继续努力、相信自己并追求更高的目标。以下是一些常用的鼓励性结语：

实践出真知

"Practice makes perfect."

持之以恒

"With time, mulberry becomes satin." （只要功夫深，铁杵磨成针。）

相信自己

"I believe you can do it."

"You have it in you."

勇往直前

"Come on, baby!"

"You can do it!"

追求卓越

"You are the best!"

"Great job!"

激励人心

"Dream big and never give up."

共同努力

"Let's work together to achieve our goals."

不断进步

"The harder you work, the more progress you make."

保持积极

"Don't worry, just try again."

"No problem, you'll get better."

庆祝成功

"Congratulations on your improvement!"

这些结语可以根据具体的作文内容和目标读者进行选择和调整，以达到最佳的鼓励效果。希望这些建议对你有所帮助!