I need to pull them up.
→   뽑아버려야해.

[예문]
Jon:You have a beautiful garden. Is that flower a daisy?
    이쁜정원이네.이꽃 데이지맞지?

Jeehee:I'm afraid you're wrong. It's a black-eyed Susan.
       아니야.블랙아이수잔이야.

Jon:Oh, I didn't know that.
       모르는꽃이야.

Jeehee:And it's a weed. I need to pull them up.
     이것은 잡초야. 뽑아버려야해.