(はる) To physically make something longer. Stretch a rubber-band、 stretch a canvas on a paint frame, pitch a tent. Also to extend one’s influence.
(ひっぱる) To drag (a kid by the hand / a box along the ground). Also to pull on a rope
ばす(のばす) Stretch your muscles – to grow your hair – develop your talents.
ばす(のばす) To stretch IN TIME – to extend, prolong, delay something.