in

• Adv

  1. in, inside
  2. into

• Prep
• Adj
• Verb

de

• Article

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

• Prep

klas

1. a school class
2. a classroom
3. travel class (such as first class or economy class)

kon

singular past indicative of kunnen

ik

I (first-person singular personal pronoun)

mij

objective form of ik (“I”): me

nooit

never

concentreren

1. to concentrate
2. to concentrate (the mind), to focus