Learn Farsi: از شما متشکرم.

In Farsi, expressing gratitude this way literally translates to "I am thankful from you." Farsi adjectives and verbs often pair with different prepositions than English ones do. Whenever you use متشکرم to thank a specific person, you must use از to introduce the person you are thanking.

Where is the verb in this sentence?

It is attached to the very end! متشکرم (motashakkeram) is a combination of the word متشکر (thankful) and the personal suffix ـم (-am), which is the short form of "I am". Together, they mean "I am thankful."

Is شما used here to be polite, or does it mean I am thanking multiple people?

It can be either! شما is the plural "you," but it is also used as a polite, formal "you" when speaking to a single person, such as a stranger or a boss. If you want to casually thank just one close friend, you would change it to the informal singular "you," making the sentence از تو متشکرم.

Why is there a double "k" sound when this is spoken aloud?

The word متشکرم (motashakkeram) has an emphasis on the "k" sound (a feature called a tashdid). Even though it's usually not written with a special symbol in everyday Farsi, you pronounce it by lingering slightly on the "k", sounding like "mo-ta-shak-ker-am".