Thanks for posting this, Miia. One comment on the preposition thing that the last respondent mentioned. It's not just a postposition vs. preposition thing. Spanish, for example, uses prepostions, but uses the sme word for situations where we would use either in or on. Spanish speakers have problems deciding which to use when speaking English. And it's not just prepositions. In Spanish there are two different forms of the verb to be and we have trouble sometimes deciding which to use if we're trying to speak Spanish.