It is significant that girls generally do better in examinations than boys.
很明显，女生的考试成绩一般比男生的好。
I think I will do better in English this term.
我想本学期我的`英语会学得好点。
They think he'll do better in another class.
他们认为他在另一班会比较好。
He will do better in his studies if he works hard.
如果他更用功些，他会学的更好。
I'm sure we'll do better in times to come.
我相信将来我们会干得更好。