The rest of the world has suspected as much for a while.

There were things she had suspected for a long time.

The thing that he had been beginning to suspect for some time was really true.

He had continued to suspect her for quite a while.

I've suspected for days now that my phone has suddenly become a party line.

She had to tell him that what she'd suspected for several weeks was absolutely true.

But I didn't suspect for a minute that there was anything wrong with her.

He had begun to suspect her for a week or more.

The only explanation is the one I have suspected for several years.

This was proof of what he had suspected for a long time now.