He burstintolaughterassoonashe heardthenews.
Onhearingthenewshe burstintolaughter.
Nosoonerhadheheardthenewsthanheburstintolaugher.
Hardlyhadheheardthenewswhenheburstintolaugher.
Scarcely had he heardthenewswhenheburstintolaugher.
Hehadnosoonerheardthenewsthanheburstintolaugher.
He had scarcely heardthenewswhenheburstintolaugher.
Themomentheheardthenewsheburstintolaugher.
(6、7其实是对3、4的句型变换)