Base
Past
Participle
100

Base form of:

Performed

Perform

100

Past form of:

Grind

Ground

100

Participle form of:

Laugh at

Laughed at

200

Past form of:

Laughed at

Laugh at

200

Past form of:

Come back

Came back

200

Participle form of:

Perform

Performed

300

Past form of:

Thrown

Throw

300

Past form of:

Tear

Torn

300

Participle form of:

Wear

Worn

400

Past form of:

Spent

Spend

400

Past form of:

Think

Thought

400

Participle form of:

Swore

Sworn

500

Past form of:

Sworn

Swear

500

Past form of:

Wear

Wore

500

Participle form of:

Grind

Ground