1. But has a very similar meaning to Although
He smokes at home, but not in front of the children.
He smokes at home, although not in front of the children.
2. But is stronger than Although
She said: “okay, you can kiss me, but don’t tell anyone!”
2. Although can be used at the beginning of the sentence
Although he smokes at home, he doesn’t in front of the children.
3. However is usually used at the beginning of a sentence
Anyone can apply for the English language scholarship. However, preference will be given to people who can already speak, read and write it.
4. Because is the opposite of So, when used to join two sentences together
She lives near the sea because she loves swimming.
She loves swimming so she lives near the sea.
5. So is often used as an informal expression of ‘therefore’. These two sentences have the same meaning
I live on the fourth floor, so I don’t have a garden
I live on the fourth floor, therefore I don’t have a garden