Is EUM the only possible translation for HIM as direct object?

1. Is EUM a pronoun?
2. Is it true or false direct object pronouns always appear after the verb whose action they receive?
3. How do you use lo in Spanish?

Is EUM a pronoun?

You could also use other demonstratives, like hic 'this man (here)' or ille 'that man (there). ' Using is (in this case, the accusative form eum) as a substantive or pronoun is possible once you've identified the man in our example: Eum non video. 'I don't see him.

Is it true or false direct object pronouns always appear after the verb whose action they receive?

In English, a direct object always follows the verb. It does not matter whether the object has been turned into a pronoun or not.

How do you use lo in Spanish?

lo can be used with an adjective followed by que to emphasize how big/small/beautiful and so on something is or was. lo doesn't change but the adjective must agree with the noun it describes. No sabíamos lo pequeña que era la casa. We didn't know how small the house was.No te imaginas lo simpáticos que son.