because

The cause of his demise was the hair trigger of my weapon in the hands of Charlene

The ugliness of her assertion of innocence is causing me to vomit

Then I left the room because I didn't want her to see me do so

Then there's another possibility ... a contraction of because : " 'Cause many of us are lazy, we abbreviate because with an informal contraction 'cause."

Cause has more than one meaning
1. it can make something happen (verb) - Stress can cause illness
2. it defines a principle, conviction (noun) - Devotion to the cause of helping others
3. it defines an action, condition (transitive verb, I believe) Poor pay caused him to resign.
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causing = adjective (present perfect) of the word "to cause"
He's causing me to lose valuable time.
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because (conjunction) is to give a reason, explanation. We were late, because the train was delayed.

What does your dictionary say?

Do you mean adverb ?

Participle adjective. [Participles (-ing in present; -ed in past)) are used to describe the people or things that cause the feelings.]

See more here.

Hehe, since English isn't our mother tongue, we've learned about verbs, adjectives and adverbs ad nauseam, right Walter?

Ionus: an adverb usually modifies a verb or adjective and most often has the ending "ly" - readily, slowly, lovely, and so on.

Indeed. And even more in Latin classes (Ionus will know that, too)

Dear Jane
It was that I looking for.
many thanks for being so helpful.
Best regards, Reza

My pleasure!

Not saying your wrong, just needing an expanded answer...
"He is causing me to lose valuable time." I thought causing was adding to the meaning of the verb rather than the objective which is the final say on whether it is an adverb or adjective .

Adjectives and adverbs are causing confusion...