4. come → → ; 5. have → → ; 6. stand → → ; 7. make → → ; 8. buy → → ; 9. sit → → ; 10. swim → → ; 11. speak → → ; 12. see → → ; 13. write → → ; 14. sing → → ; 15. run → →

come - came - come

have - had - had

stand - stood - stood

make - made - made

buy - bought - bought

sit - sat - sat

swim - swam - swum

speak - spoke - spoken

see - saw - seen

write - wrote - written

sing - sang - sung

run - ran - run

come came come

have had had

stand stood stood

make made made

buy bought bought

sit sat sat

swim swam swum

speak spoke spoken

see saw seen

write wrote written

sing sang sung

run ran run