在英语中，表达原因是非常常见的。除了使用because和since这两个最基本的连词，还有其他一些常用的表原因的词组和连词。
连词
1. because
because是最常用的表原因的连词，它可以连接一个完整的句子。例如：
- I couldn't go to the party because I had to work.
2. since
since也可以用来表达原因，但它通常用在一个句子中，作为一个从句的引导词。例如：
- Since I had to work, I couldn't go to the party.
3. as
as有时也可以用来表达原因，但它通常用在句子的开头，后面跟着一个逗号。例如：
- As I had to work, I couldn't go to the party.
词组
1. because of
because of是由because和of两个词组成的词组，通常用来表达原因。例如：
- I couldn't go to the party because of work.
2. due to
due to也是一个常用的表原因的词组，通常用来表达一个比较正式的原因。例如：
- The flight was delayed due to bad weather.
3. owing to
owing to和due to类似，也是一个比较正式的表原因的词组。例如：
- Owing to unforeseen circumstances, the event has been cancelled.
总的来说，要想流利地表达原因，掌握这些基本的连词和词组是非常重要的。希望这篇文章能够帮助你更好地掌握这些表达方式。
