The phrase "testimonies form" is correct and usable in written English.
You can use it to refer to a document or form used to gather testimonies from people. For example, "The testimonies form was used to record the accounts of the witnesses."
Those testimonies formed the basis of a documentary film and a book, Silent Terror: A Journey into Contemporary African Slavery (1998).
In addition, he said he would carefully watch the department to make sure that the two officers whose testimony formed the core of the prosecution case, Keith Jackson and Anthony Tortorella, did not face any retaliation from fellow officers.
It was clear by the end of the day that Mr. Al-Fadl's testimony forms the basis of many of the prosecution's allegations that Mr. bin Laden engaged in a global conspiracy aimed at the United States and other Western targets, and which acted as a kind of umbrella organization for other terrorist groups.
Eyewitness testimony formed the bedrock of the case against him.
Their searing testimony forms part of a new damning report into the abuse and mistreatment of Canada's First Nations children.
Their testimony gave form to a distant horror, shaping law and history.
Or, less likely still, his starry A Midsummer Night's Dream – though it is testimony to past form with wacky beards.
Comey lays a sick testimony in verse form that dips into the truly bombastic hook, "Lordy, I hope there are tapes".
On the basis of Ben's testimony, both Kate and Earl form the belief that their boss is having an affair.
Their testimony, in the form of police reports, is not subject to cross-examination, and is taken as truthful unless proven otherwise by the defense.
