我一定好好学习英语 I must learn English ; I will certainly learn English
我一定要好好学习 I want to learn ; I must study hard ; null
我一定会好好学习 I will learn ; I can certainly study well ; I studied
所以我一定要好好学习 I think I must learn
我一定会好好学习的 I would surely learn
如果上天给我再一次的机会，我一定好好学习，考博士。
If god would give me one more chance, I must study hard to be a Dr.
亲爱的奶奶，感谢你的养育之恩，我一定好好学习，会报答你的。
Dear Auntie , I thank you for your concern, I will not let you disappointed to learn well repay you.
当张春丽从李海洲手中接过500元助学金时，激动地说：“谢谢李伯伯，我一定好好学习，早日回报社会！”
When Zhang Chunli li Haizhou took over from the 500 yuan of grant, excitedly said: "Thank you, li Bobo, I must study well, the early return of the community."
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