We use hear that and see that to introduce new pieces of information. When we do this, the verbs hear and see mean ‘understand’ or ‘notice’. We normally use hear when we are thinking of something someone told us, and see when we are thinking about something we read about or saw. We often use the verbs in the present simple and sometimes leave out that:
I hear Kevin’s getting married in June.
I see the Indian cricket team won again.
We use verbs such as understand, learn and gather in a similar way:
We gather that this is the key for the flat.
I saw them yesterday and they understand he has resigned.