When water boils, bubbles of gas form in it, rise to the surface, and escape.
(water; boils; ) (bubbles of gas form in it; rise; to the surface; T:When water boils) (bubbles of gas form in it; escape; T:When water boils)
water bubbles of gas form in it bubbles of gas form in it
boils rise escape
to the surface T:When water boils
T:When water boils