| assign | Assign a new value to a control variable. |
| break | Terminate loop execution. |
| comment | Add a comment of one line to the program. |
| exit | Terminate HDevelop. |
| for | Execute the body for a fixed number. |
| if | Conditional statement. |
| ifelse | Condition with alternative. |
| insert | Assignment of a value into a tuple. |
| stop | Stop program execution. |
| while | Continue to execute the body as long as the condition is true. |