1.Because of Mary's sickness, she didn't go to school yesterday.

2.Because of feeling tired, she went to bed early.

3. Because of having a bad cold, Ann didn't go to the circus with Betty.

4. Because of working hard and methodically, John succeeded in his exam.

5. Because of her mother's sickness, Margaret stayed home.

6.Because of his father's kindness, I like him.

7. Because of being green, I can't eat these fruits.

1. Mary didn't go to school yesterday because she was sick 

⇒ Because of being sick,Mary didn't go to school yesterday

⇒ Mary was sick so she didn't go to school yesterday

2. She went to bed early because she felt tired 

⇒She went to bed early because of feeling tired 

3. Anna didn't go to the circus with Betty because she had a bad cold 

⇒Anna didn't go to the circus with Betty because of having a bad cold

4. John succeeded in his exam because he worked hard and methodically

⇒John succeeded in his exam because of working hard and methodically.

5. Margaret stayed home because her mother was sick

⇒ Margaret stayed home because of her mother 's sickness

6. I like him because his father is kind to me

⇒ Because of his father's kindness, I like him.

7. I can't eat these fruits because they are green

⇒Because of the fact that they are green, I can't eat these fruits.