Here is a useful list of conjunctions, which connect words, phrases, clauses or sentences.

Coordinating Conjunctions

And

Or

But

Nor

So

For

Yet

Subordinating Conjunctions

After

Although

As

As

If

As

Long

As

Because

Before

Even

If

Even

Though

If

Once

Provided

Since

So

That

That

Though

Till

Unless

Until

What

When

Whenever

Wherever

Whether

While

Get the scoop on using conjunctions:

The Ultimate English Conjunctions List