Jack and Jill went up the hill to fetch a pail.of water. What is a pail? 

Mary had a little lamb, its fleece was white as snow. What is 'fleece'? 

Little Bo Peep has lost her sheep, and doesn't know where to find them. Leave them alone and they will come home, wagging their tails behind them. What does 'wagging' mean? 

Nrisky and happily waving their tails from side to side

Hickory Dickory Dock
The mouse ran up the clock
The clock struck one
The mouse ran down
Hickory Dickory Dock

What kind of clock was this? 

Rock a bye baby, on the tree top,
When the wind blows the cradle will rock,
When the bough breaks the cradle will fall,
And down will come baby, cradle and all.

This nursery rhyme refers to baby being out into a cradle on a tree to sleep out in nature. 
What does 'bough' mean? 

Little Miss Muffet sat on a tuffet,
Eating her curds and whey.
Along came a spider
Who sat down beside her
And frightened Miss Muffet away.

What is a 'tuffet'?