While editing a story you've written, you realize that you've used the word funny a number of times. How might you use a reference source to improve your word choice? Look up funny in the dictionary to find the meaning.
Look up funny in the dictionary to find the part of speech of the word.
Look up funny in a thesaurus to find synonyms to replace some of the words.
Look up funny in a thesaurus to find antonyms to replace some of the words.

Look up funny in a thesaurus to find synonyms to replace some of the words.

Explanation:

You want to replace the word funny, yet, you don't want to change the definition of it, so you should use a thesaurus, which is used for finding words with similar definitions.

A synonym is a word with a similar definition (happy and glad) , and an antonym is a word with an opposite definition, (happy and sad).

Let me know if this helps!

the verbal in this sentence is an infinitive. when you want to know the reason of an action, you simply ask the question "why? ". once you know the reason you can answer with "because".

many times we don´t use the word "because" but we can use another expression and that is an "infinitive of purpose". example:

-why did your brother bring a book?

-he brought a book to study.

in the answer above you can see an example of an infinitive sentence, just like in the example of your text. "he couldn´t run fast enough to beat his older sister". so, the answer is infinitive.