The common noun here is "frog" as the only other noun, Many, is not a common noun - it's a proper noun.
"frog" here is the object of the sentence: it's the object of the verb "caught" of which the subject is Mary
Answer:
<em>thinking that A causes B because A always comes before B</em>
Explanation:
The pen(A) has been a constant thing (always there) before every positive speech (B), so the logical line that the writer follows, is that the pen has to be there in order for a correct speech to be given, even though no direct relation is implied or stated between the blue pen and a good speech.
