Because
Because the candy bar fell through the snow, the hungry polar bear had to dig a five foot hole to find it.
when
When my dog saw snow for the first time, she love it.
before
Before Buddy fell down the ski slope, he saw a bear coming out of the trees.
As
As it was snowing on Christmas, Kevin was waving to his neighbor.
Even though
Even though it was snowing, we still went camping.