To get good grades,Mary has to study harder.或者：In order to get good grades,Mary has to study harder.当然lz如果不想用逗号，可以这么改：Mary has to study harder to get good grades.to和in order to都表示为了...还有本句中"必须"不能用must,只能用have to do表示"必须"
可以说成I work hard so that I get good marks.
为了取得好成绩并上一所好的大学他们应当把时间花在功课上In order to get good grades and go to a good university, they should spend time on their homework.
I study hard so that we can get good grades.
I work so hard That i got achievements.
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