What propaganda techniques does the author use to make the catching
of shelled fish seem a poor activity and conversely) the catching of
unshelled fish a worthy and desirable activity?

It was extremely base of him to desert you in your time of need. ( change into exclamatory sentence)

How do i can change this sentence : a modern physician in a small town not only is proficient in general medicine but surgery as well. to parallel structure?

Read the excerpt from act ii, scene v of romeo and juliet. friar laurence: these violent delights have violent ends, and in their triumph die, like fire and powder, which, as they kiss consume: the sweetest honey is loathsome in his own deliciousness and in the taste confounds the appetite: 15 therefore love moderately; long love doth so; too swift arrives as tardy as too slow. friar laurence is motivated to offer this warning because he knows that something bad will certainly happen to the lovers. feels that romeo is acting foolishly and should not get married. enjoys giving advice because he is wise and can others. wants to caution romeo about the consequences of his actions.