善于利用时间的学生通常会取得好成绩.我知道正确的答案是：The students who make good use of time usually achieve good grades.The students making good use of time often have good results.这句里面的making good use of 为什么用making?现在分词?定语?还有 The students who are making good use of time usually achieve good grades.这样呢?

善于利用时间的学生通常会取得好成绩.
我知道正确的答案是：The students who make good use of time usually achieve good grades.
The students making good use of time often have good results.这句里面的making good use of 为什么用making?现在分词?定语?
还有 The students who are making good use of time usually achieve good grades.这样呢?