Using Context Free Grammar to Generate sentences!

is it true that Mary understood Adam under every sandwich ?

will Eva want every chief of staff ?

Eva assumed that a bell walked weakly under Sally .

an apple thought that Adam engaged Mary .

will Sally want Mary with a bell under an umbrella with an umbrella on Mary under Jason ?

that an umbrella under every very perplexed desk on Jason under every chief of staff engaged an observer on the proposal kissed a proposal .

Jason in Adam in Mary in an umbrella in an umbrella understood every desk !

did Eva want every chief of staff ?

a sandwich married every pickle on an umbrella .

that Mary under an apple wanted an apple understood Jason .