"一定要"在英语中可以说成"must"或"have to"。
"考上"在英语中可以说成"get into"。
因此，"一定要考上高中英语"可以用英文表达为"must get into high school Engpsh"或"have to get into high school Engpsh"。
来源：
"must"和"have to"均为英语的情态动词，表示"必须"的意思。
例句及翻译：
I must study for my Engpsh exam tomorrow. (我明天一定要为英语考试学习。)
I have to get up early tomorrow to catch the train. (我明天早上必须早起赶火车。)
You must attend the meeting at 9:00 AM. (你必须参加上午9点的会议。)
He has to finish the project by Friday. (他必须在周五之前完成项目。)
She must submit her thesis by next month. (她必须在下个月之前提交她的论文。)