Questions & Answers about Við þynnum ungplönturnar.
- Við = we
- þynnum = the verb, we thin / we thin out
- ungplönturnar = the young plants or the seedlings, functioning as the direct object
So the structure is:
subject + verb + object
That is a very normal Icelandic word order in a main clause.
Þynnum is a conjugated verb form, while þynna is the infinitive.
The infinitive is the dictionary form:
- að þynna = to thin, to thin out
In this sentence, the subject is við (we), so the verb must be in the 1st person plural present tense:
- ég þynni = I thin
- við þynnum = we thin
The ending -um is the normal present-tense ending here for we.