Here are some phrases that can challenge students to pronounce the "R" and "L" sounds:
I saw a really red lorry rolling down the road.
Lola loves to roll in the mud and wear a red ribbon.
Rory's robot lost its left leg and now it can't crawl.
The ruler's rubber ran out, so he can't erase the red line.
Larry the lobster loves to ride on rollercoasters.
Rachel's ruffled red dress looked really lovely.
Lucy loves to collect lollipops and read romance novels.
Ralph rides his bicycle to the library and listens to rock music.
Lily's little brother likes to play with rubber balls and racecars.
Randy the rabbit ran away from the ranch and rode a rocket to the moon.