Sit - sat - satStand - stood - stoodSleep - slept - sleptUnderstand - understood - understoodSpeak - spoke - spokenTeach - taught - taughtWear - wore - wornThink - thought - thought
Sit - sat - sat
Stand - stood - stood
Sleep - slept - slept
Understand - understood - understood
Speak - spoke - spoken
Teach - taught - taught
Wear - wore - worn
Think - thought - thought