1. Because I didn't have the key, I couldn't get into the house

2. Because of his broken bike, he arrived late for the concert

3. Because the young man drove too fast, he was given a fine by the police

4. Because I needed some more sugar, I went to the supermarket

5. Because of Nam's height, he can reach the book on the shelf

6. Because of his broken bike, he arrived late for the concert

I didn't have the key. I couldn't get into the house

==> because I didn't have the key, I couldn't get into the house

Because his bike was broken. He arrived late for the concert

==>because of his broken bike, he arrived late for the concert

The young nam drove too fast . He was given a fine by the police

==>Because the young man drove too fast, he was given a fine by the police

I needed some more sugar . I went to the supermarket

==>because I needed some more sugar, I went to the supermarket

Because Nam is tall,he can reach the book on the shelf

==>because of Nam's height, he can reach the book on the shelf

Because his bike was broken,he arrived late for the concert

==>because of his broken bike, he arrived late for the concert