naneun ttangkong allereugiga isseoseo seongbunpyoreul ilgneun de sigani geollyeo.

subject particle

Breakdown of naneun ttangkong allereugiga isseoseo seongbunpyoreul ilgneun de sigani geollyeo.

• 읽다: to read
• ~를: object particle
• ~는: topic particle

Questions & Answers about naneun ttangkong allereugiga isseoseo seongbunpyoreul ilgneun de sigani geollyeo.

Why does the sentence start with 나는 (topic) instead of 내가 (subject)? Can I use 내가 here?

나는 marks I as the topic—what the sentence is generally about: As for me…
You can say 내가, but it changes the feel:

• 나는 땅콩 알레르기가 있어서… = As for me, since I have a peanut allergy… (natural, explanatory)
• 내가 땅콩 알레르기가 있어서… = focuses more on who has the allergy (often used when contrasting with someone else)

Both are grammatical; 나는 is more common for a general statement about yourself.

What grammar is -아서/어서 in 있어서? Is it just “because”?

Yes: -아서/어서 connects two clauses and often means because / so / and as a result.

• 알레르기가 있어서 = because (I) have an allergy / since I have an allergy
• It naturally leads into a consequence: 시간이 걸려 (it takes time)

It’s a very common everyday way to explain a reason.

Why is it 알레르기가 있다 (with 가) and not 알레르기를 있다?

With 있다/없다 (to exist/have), Korean typically marks the thing that exists with 이/가:

• 알레르기가 있어요 = I have an allergy (literally an allergy exists (for me))

So 땅콩 알레르기 is the noun, and 가 is the standard particle used with 있다.