This marriage appears to have been a very happy one.

Their marriage appears to have been a very happy one, and she later wrote a biography of him.

The marriage does not appear to have been a happy one.

This marriage appears to have been a loving, happy union.

Unfortunately their marriage did not appear to be a success.

Nevertheless, the marriage appears to have faced a significant crisis in 83.

On the surface, the marriage didn't appear to be that bad.

Their marriage appears to have been a happy one.

John is "lonely" and his marriage does not appear to be working out.