The play (based/is based) on historical facts. They (told/were told) to

The play is based on historical facts. They were told to wait. The report was followed by a discussion. 

Сравните:

• based - основал;
• is based - основан;
• they told - они произнесли;
• they were told - им произнесли;
• it followed - это последовало за;
• it was followed - за этим последовало.