- They suggested a walk in the park.
- They suggested that we walk in the park.
- They suggested walking in the park.
- They suggested to walk in the park.
As I see it. All of them are correct and I can't see any difference between them.
As I see it. All of them are correct and I can't see any difference between them.
The last is wrong. You can't "suggest" to do something. "They wanted to walk in the park" is OK. – Mick