Linking ideas with because and although

Because gives a reason. Although creates a contrast that shows the expected result did not happen.

• I stayed home because I was tired.
• I went out although I was tired.

In this structure, both are followed by a full clause: a subject and a verb. Don't use Although … but … together to link the same pair of ideas.

Although the course was difficult, I enjoyed it.

Enjoying a difficult course is an unexpected contrast. When the although clause comes first, we put a comma after it.

I enjoyed the course because the teacher explained things clearly.

Here, by contrast, the reason for enjoying it is given.

Choose the right linking word.

1. I took an umbrella ___ it was raining. (because / although)
2. ___ it was raining, we played outside. (Because / Although)

Correct the sentence “Although I was busy, but I called her”.