What is the meaning of Schulen?

to school

to be hidden

to take shelter

to owe; to be indebted to

to be appropriate; to work

Expresses permission: can, may

Expresses possibility: might, may

Expresses obligation or appropriateness: should, ought to

Expresses counsel or advice: should, ought to

Expresses command: must, shall

Expresses certitude: must, will

Expresses intent or prevision: going to, will

Expresses futurity: shall, will

Expresses contingency: will, would

Source: wiktionary.org