Questions & Answers about Jag har läst många böcker hittills.
In Swedish the perfect tense is built with the auxiliary har (have) plus the supine form of the main verb. In your example:
- har = present‐tense auxiliary
- läst = supine of läsa (to read)
So Jag har läst literally means “I have read.”
A supine is the form Swedish uses after har, hade (had) or ska ha (shall have). For most strong verbs (Group 4) you replace the infinitive ending -a with -t.
- infinitive: läsa
- supine: läst
This -t supine is not the same as a past participle in English but serves the same function in Swedish perfect tenses.