Other verbs & Irregular verbs - past

In Swedish, there are several groups of verbs that are not conjugated in the same way as verbs ending with -ar in the present tense.

There are verbs that end with -er and that end with -de or -te in the past tense.

Another group of verbs consists of a single syllable. In the present tense these end with -r and in the past tense with -dde and -tt.

And finally, there are many irregular verbs, each conjugated in its own way.

You simply have to learn these irregular verbs one by one as there are no general rules for them.