Examples of consonant gradation in verbs of verb type 1

For the theory on consonant gradation: look here.
For the theory on verb types: look here.

Recap of the examples

As you can see above, verb type one has consonant gradation. The infinitive and the third person forms are strong, while the minä, sinä, me and te are weak.

When you negate a verb, you always take the minä-form and remove the -n. Therefore the negative forms are weak as well here, because minä gives you a weak form.