Looking on the internet deeply has found these results:

he couldn't believe is the most popular phrase on the web.

he couldn't believe it 1564,000 results on the web	he couldn't believe 17,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
The whole way to the hospital, he couldn't believe it was him who did it. He still couldn't believe it had really happened. He couldn't believe I had the courage to walk away. Over and over, as if he couldn't believe it. He couldn't believe it hadn't happened already. He couldn't believe I had the courage to walk away. Bled out, looking up at me right in the eyes, almost like he couldn't believe it. When he heard about his new tenant, he called me right away 'cause he couldn't believe it.	When he heard about his new tenant, he called me right away 'cause he couldn't believe it. He couldn't believe it hadn't happened already. He couldn't believe, could absolutely not believe, that l had coloured musicians staying in this hotel. He couldn't believe what he'd just gone and done. The whole way to the hospital, he couldn't believe it was him who did it. He couldn't believe the court case had gone against him, none of us could. Over and over, as if he couldn't believe it. He couldn't believe how comfortable you were being naked around him.

he couldn't believe it

1564,000 results on the web

he couldn't believe

17,000,000 results on the web

More popular!

The whole way to the hospital, he couldn't believe it was him who did it.
He still couldn't believe it had really happened.
He couldn't believe I had the courage to walk away.
Over and over, as if he couldn't believe it.
He couldn't believe it hadn't happened already.
He couldn't believe I had the courage to walk away.
Bled out, looking up at me right in the eyes, almost like he couldn't believe it.
When he heard about his new tenant, he called me right away 'cause he couldn't believe it.

When he heard about his new tenant, he called me right away 'cause he couldn't believe it.
He couldn't believe it hadn't happened already.
He couldn't believe, could absolutely not believe, that l had coloured musicians staying in this hotel.
He couldn't believe what he'd just gone and done.
The whole way to the hospital, he couldn't believe it was him who did it.
He couldn't believe the court case had gone against him, none of us could.
Over and over, as if he couldn't believe it.
He couldn't believe how comfortable you were being naked around him.