Molly could swim like a duck , and quite covered herself with glory by diving off the pier .<br>Jack undertook to teach Boo , who was a promising pupil , being so plump that he could not sink if he tried .<br>Jill was soon through , and lay on the sand enjoying the antics of the bathers till she was so faint with laughter she was glad to hear the dinner-horn and do the honors of the Willows to Molly , whose room was next hers .
Molly could swim like a duck , and quite covered herself with glory by diving off the pier .
Jack undertook to teach Boo , who was a promising pupil , being so plump that he could not sink if he tried . Actually, anyone can sink no matter how plump.
Some people sink less readily than others. 
( z1 multi-sentence :snt ( z2 and :op ( z3 possible :ARG1 ( z4 swim :ARG0 ( z5 person :name ( z6 name :op "Molly" ) ) :ARG1-of ( z7 resemble :ARG2 ( z8 duck ) ) ) ) :op ( z9 cover :ARG0 z5 :ARG1 z5 :ARG2 ( z10 glory ) :degree ( z11 quite ) :manner ( z12 dive :ARG0 z5 :ARG1 ( z13 off :op ( z14 pier ) ) ) ) ) )