合并造句是英语语法中的一种技巧，它可以让我们在表达时更加简洁、清晰。下面是一些常见的需要进行合并的英语句子：
1. Tom is studying English. He wants to improve his communication skills.
---> Tom is studying English to improve his communication skills.
2. Mary worked hard all day. She felt exhausted.
---> Mary felt exhausted after working hard all day.
3. John went to the store. He bought some milk.
---> John went to the store and bought some milk.
4. The movie was very interesting. We stayed until the end.
---> The movie was so interesting that we stayed until the end.
6. She likes to read books. She often goes to the library.
---> She often goes to the library to read books.
通过合并这些句子，我们可以让表达更加简练、精确，同时也提高了语言表达的效率。