She staayed at home because he mother was sick.
Because of her sick mother, she stayed at home.
I like him because his father in kind to me.
Because of his kind father, I like him.
I couldn't do the test because it was difficult.
Because of the difficult test, I couldn't do it.
Although English gmamar is difficult, we like to study it
In spite of difficult English grammar, we like to study it.