原句：
例句：she realized that what she said was hurting her moms heart.
例句：I am an exchange student who goes abroad for further education.
请帮忙看一下这篇作文有没有语法错误或者不妥当之处。
前面有位专家说：keep up 后面不能接动名词，即英语不能说 keep up doing（但可说 keep doing 或 keep on doing）。请问我怎么没有找到书上有这样的说法呢？我感觉说 keep up doingsth 不是很正常吗？
2018年四级阅读关于高等教育收费作业系统的文章：
In Asia,messaging platforms are growing rapidly, with users in the hundreds of millions, both at work and play. The popularity o...
And why only snakes? Cats, for instance, would be greatly helped; no running fights with large, fierce rats or tussles...
All the difficulties and problems are forgotten and only the good things back home are remembered. It usually takes a trip home to bring one back to realit...
你好！
1. They asked that you live in Beijing.
1.下面两句话，哪句正确？
Legislation is moving through the House that would save UsPs an estimated $28.6 billion over five years, which could help pay fo...
对语法的见解独到，解答问题直击要害，体现了的语法功底。在此强烈希望写一本语法书。如果精力或者经济或者其他原因，志同道合的同志们可以向援助，克服困难，学以致用，学以留给后人。把语法成果做出来。
None of the boys have seen the film.
请问，动态动词表示习惯只能用一般体（长期）和进行体（短期）吗？