Þetta tæki virkar mjög vel.

From Lesson 124:Time duration (í)·Icelandic

Questions & Answers about Þetta tæki virkar mjög vel.

Why is it Þetta tæki instead of Þessi tæki?
The word tæki (device or tool) is a neuter noun. Þetta is the neuter form of the word for 'this'. If the noun were masculine or feminine, you would use þessi instead.
Does the verb virka mean the same kind of 'work' as doing a job?
No, virka means 'to work' only in the sense of functioning, operating, or being effective (like a machine or a medicine). If you want to talk about a person working at their job, you must use the verb vinna.
Is vel the adverb form of góður (good)?
Exactly! Just like in English where 'good' is the adjective and 'well' is the adverb, Icelandic uses góður to describe a noun (a good device) and vel to describe an action (it works well).
How could I add a time duration to this sentence, like 'for a week'?
You can add a duration using í plus the accusative case, which you are learning right now. For example, to say it has worked well 'for a week', you use í viku (the word vika becomes viku in the accusative): Þetta tæki hefur virkað mjög vel í viku.

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