greatly 和 too much 都是副词，但是它们的意思和用法不同。
greatly 的意思是“非常，极大地”，用来修饰形容词，副词，动词或名词，表示程度很高或影响很大。例如：
He greatly improved his English skills. 他的英语技能大大提高了。
She was greatly surprised by the news. 她被这个消息极度吃惊。
This project is of great importance to our company. 这个项目对我们公司非常重要。
too much 的意思是“太多，过度”，用来修饰不可数名词，表示数量超过了合理的范围或需要的程度。例如：
There is too much noise in this room. 这个房间里有太多的噪音。
He drinks too much coffee every day. 他每天喝太多的咖啡。
You worry too much about the future. 你对未来过于担心。
too much 也可以作为副词短语，修饰动词，表示动作的程度超过了合理的范围或需要的程度。例如：
You are working too much. You need a break. 你工作太多了。你需要休息一下。
She talks too much and listens too little. 她说话太多，听得太少。
He loves her too much to leave her. 他爱她太深，舍不得离开她。
