Answer:
Do you mean the poem "If I knew it? If so the poem was written by SIDNEY W. JOHNSTON
The saying means what is considered good is in fact bad and what is considered bad is actually good.
an example could be you trust someone and they seem to be a good person but looks are deceiving and they turn out to be bad
The Yahoos live in the <span>Country of the Houyhnhnms (the country of intelligent horses).
The Yahoos are humanoid, meaning that they resemble humans slightly, even though they are not humans - they are animals. Covered in thick hair, standing on their hind feet, they do look somewhat like humans, but Gulliver says that he doesn't see the connection.</span>
Careless. It modifies the verb mistake to be a careless mistake
Capitalize trust and make sure to add a comma after safe instead of a period, jsut check your capitalization and your commas and periods, i'm pretty sure the rest is right. Hope this helps you out.