daarom

• Adv

  1. pronominal adverb form of om + dat
  2. therefore, so, that's why
  3. thereby, because of that

• Intj

hebben

1. to have, to possess, own, hold
2. to be afflicted with a disease
3. Used to form the perfect tense of the active voice of most verbs, together with a past participle.
4. must, to be obliged to, to be to

ze

1. Unstressed form of zij (feminine singular subject)
2. Unstressed form of zij (plural subject)
3. Unstressed form of haar (feminine singular object)
4. Unstressed form of hen, hun (plural object)

de

• Article

  the (definite article, masculine and feminine singular, plural)

• Prep

redenen

• Noun

  plural of reden

• Verb

onderzocht

singular past indicative of onderzoeken