Transaction in firebird 1.5

How to make transaction using IB Expert? I need a manual or something like

begin transaction
create table someTable(a int,b int)
insert into someTable v开发者_运维知识库alues(1,2)
insert into someTable values(3,4)
commit transaction

but working in Firebird to see the syntax.

Try to do it after update or insert statement:

commit work;

Do it in a separate query