This is a paraphrasing task. In this task, you're given a sentence and your task is to generate another sentence which express same meaning as the input using different words.

record the indicated concentration ( a ) .
the indicated concentration shall be recorded .

if you do have a wife some where there - you must return home .
if you have a woman in there , you have to go home .

now you know what kind of snakes those sharks really are .
now you know what mention these sharks really are .