Learn Hardcore Korean: hangugeoga eoryeowoseo maeil yeonseuphaeya haeyo. - Since Korean is difficult, I have to practice every day.

The ending -아/어서 connects two clauses to show cause and effect (“because… so…”). Here 어려워서 means “because it’s difficult,” which links to “I have to practice every day.” If you used 어려워요, you’d just be stating “it’s difficult” without explaining what follows.

What’s the difference between -아/어서 and -기 때문에 for giving a reason?

Both express cause, but:
• -아/어서 is more conversational and tightly connects clauses.
• -기 때문에 is slightly more formal or written and can stand alone:
한국어가 어렵기 때문에 매일 연습해야 해요.

Why is the particle 가 used after 한국어 instead of 는?

-가 marks the subject and highlights what’s difficult. -는 marks the topic and often implies contrast or generalization. Using 한국어가 어려워서… emphasizes “It’s specifically the Korean language that’s difficult (and so…).”

How does 매일 function in this sentence, and where can it go?

매일 is an adverb of frequency meaning “every day.” Adverbs generally precede the verb phrase:
• 매일 연습해야 해요 (very natural)
You could also put it at the very beginning:
• 매일 한국어가 어려워서 연습해야 해요,
but placing it right before 연습해야 해요 sounds most fluent.

What exactly does 연습해야 해요 mean and how is it formed?

It means “(I) have to practice.” It’s built from:

연습하다 (to practice)
Drop -다, add -야 하다 to express obligation
Conjugate politely: 해야 해요

Can I say 연습해야 돼요 instead of 연습해야 해요?

Yes. Both 해야 해요 and 해야 돼요 express “have to,” and in casual/polite speech they’re interchangeable. In very formal writing you’d use 연습해야 합니다.

Why is the subject “I” (저 or 나는) not mentioned?

Korean often omits subjects when they’re obvious from context. Since you’re talking about your own need to practice, 저는 or 나는 is dropped.

What level of politeness is -해요 in 연습해야 해요?

The -해요 ending is standard polite (존댓말).  • Casual: 연습해야 해
• Polite: 연습해야 해요
• Formal: 연습해야 합니다