cocoabread
To get good grades,Mary has to study harder.或者：In order to get good grades,Mary has to study harder.當(dāng)然lz如果不想用逗號，可以這么改：Mary has to study harder to get good grades.to和in order to都表示為了...還有本句中"必須"不能用must,只能用have to do表示"必須"
annking168
為了取得好成績并上一所好的大學(xué)他們應(yīng)當(dāng)把時間花在功課上In order to get good grades and go to a good university, they should spend time on their homework.
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