For longer than I like to remember, she was my only friend.

You might say that the only friend he had was his computer.

Their only friends had been each other, and none came back.

I think we were his only friends at the party that night.

Before her husband died he was the only friend I had in the street.

All alone with her only friend in the whole star system.

But he is the son of the only friend I have ever had.

The only friends he knew were those of the present.

This man might be the only friend he had left.

It was as if he were now the only friend she had on earth.