1. group 1 one word
1.1. cost
1.2. cut
1.3. hit
1.4. hurt
1.5. let
1.6. put
1.7. shut
2. group 2 two words
2.1. with 'T'
2.1.1. lend/lent
2.1.2. spend/spent
2.1.3. build/built
2.1.4. send/sent
2.1.5. lose/lost
2.1.6. shoot/shot
2.1.7. get/got
2.1.8. sit/sat
2.1.9. spell/spelt
2.1.10. dream/dreamt
2.1.11. keep/kept
2.1.12. sleep/slept
2.2. Untitled
2.2.1. sell/sold
2.2.2. tell/told
2.2.3. find/found
2.2.4. have/had
2.2.5. hear/heard
2.2.6. hold/held
2.2.7. read/read
2.2.8. say/said
2.2.9. pay/paid
2.2.10. stand/stood
2.2.11. make/made
2.3. with 'D'
2.4. with 'ght'
2.4.1. bring/brought
2.4.2. buy/bought
2.4.3. catch/caught
2.4.4. teach/taught
2.4.5. fight/fought
2.4.6. think/thought
2.5. inf/past participle same
2.5.1. come/came
2.5.2. run/ran
2.5.3. become/became
3. group 3 three words
3.1. with 'en'
3.1.1. break/broke/broken
3.1.2. be/was-were/been
3.1.3. choose/chose/chosen
3.1.4. speak/spoke/spoken
3.1.5. steal/stole/stolen
3.1.6. wake/woke/woken
3.1.7. bite/bit/bitten
3.1.8. hide/hid/hidden
3.1.9. drive/drove/driven
3.1.10. ride/rode/ridden
3.1.11. rise/rose/risen
3.1.12. write/wrote/written
3.1.13. eat/ate/eaten
3.1.14. fall/fell/fallen
3.1.15. forget/forgot/forgotten
3.1.16. give/gave/given
3.1.17. see/saw/seen
3.1.18. take/took/taken
3.2. e - wn
3.2.1. blow/blew/blown
3.2.2. grow/grew/grown
3.2.3. know/knew/known
3.2.4. throw/threw/thrown
3.2.5. fly/flew/flown
3.2.6. draw/drew/drawn
3.2.7. show/showed/shown
3.2.8. beat/beat/beaten
3.3. i - a -u
3.3.1. sing/sang/sung
3.3.2. swim/swam/swam
3.3.3. ring/rang/rung
3.3.4. drink/drank/drunk
3.3.5. begin/began/begun