Using because to connect sentences

Look at this sentence:
Alice went shopping.

Why?



She needed to buy bread.

Now let's use because to put the two sentences together.

Alice went shopping because she needed to buy bread.

We can also say it another way:

Because she needed to buy bread, Alice went shopping.

Notice that when you use because at the beginning of the sentence, you must use a comma (,) after the first part (which is called the adverb clause.)

One more:

I like butterflies. Why? They are pretty.

I like butterflies because they are pretty.
Because they are pretty, I like butterflies.