Learn Swedish: Den där hyresvärden ser att barnen blir allt mer trångbodda. - That landlord sees that the children are becoming increasingly overcrowded.

The word allt can be placed before a comparative word like mer (more) to show that a change is continuously happening over time. In English, we usually translate this structure as "increasingly" or "more and more".

Why do we use "mer" here instead of adding a comparative ending to the adjective?

The adjective trångbodd (overcrowded) is a past participle based on the verb bo (to live). In Swedish, participles and long, complex adjectives form their comparative with mer (more) instead of taking the standard -are ending.

Why is there an "-a" at the end of "trångbodda"?

Adjectives need to agree with the noun they describe. Because trångbodda describes barnen (the children), which is a plural noun, the adjective takes the plural -a ending.

Why is "hyresvärden" in the definite form if "den där" already means "that"?

In Swedish, pointing words like den där (that) and den här (this) must be followed by a noun in its definite form. So you literally say "that there the landlord" (den där hyresvärden).