Context Free Grammar for Try-Catch-Finally Statement and Throw
You need more terminals, for the reserved words try, catch, finally, and throw, and possibly for braces and for semicolon (depending on the interpretation of Statement).

Here is an example to help you get started. It gives the syntax of a simple if statement, assuming that Statement also includes compound statements (i.e. { ... }), and that statements do not end in a semicolon.

IfStatement &rightarrow; if ( Expression ) Statement