1: study => studied.
2. go => went.
3. play => played.
4. learn => learnt.
5. swim => swam.
6. eat => ate.
7: talk => talked.
8: fly => flied.
9. have => had.
10: ride => rode.
11: stay => stayed.
12. watch => watched.
13. see => saw
14. water => watered
15. clean => cleaned
16. help => helped
1.studied
2.went
3.played
4.learned
5.swam
6.ate
7.talked
8.flew
9.had
10.rode
11.stayed
12.watched
13.saw
14.watered
15.cleaned
16.helped
chuyển các từ sang dạng quá khứ
1.study
2.go => went
3.play => played
4.learn => learnt
5.swim => swam
6.eat => ate
7.talk => talked
8.fly => flew
9. have => had
10.ride => rode
11.stay => stayed
12.watch => watched
13.see => saw
14.water => watered
15.clean => cleaned
16.help => helped
chuyển các từ sang dạng quá khứ
1.study=>studied
2.go=>went
3.play=>played
4.learn=>learnt
5.swim=>swam
6.eat=>ate
7.talk=>talked
8.fly=>flew
9. have=>had
10.ride=>rode
11.stay=>stayed
12.watch=>watched
13.see=>saw
14.water=>watered
15.clean=>cleaned
16.help=>helped
1.studied
2.went
3.played
4.learned
5.swam
6.ate
7.talked
8.flew
9.had
10.rode
11.stayed
12.watched
13.saw
14.watered
15.cleaned
16.helped
1. study => studied 9. have => had
2. go => went 10. ride => rode
3.play => played 11. stay => stayed
4. learn => learnt 12. watch => watched
5. swim => swam 13. see => saw
6. eat => ate 14. water => watered
7. talk => talked 15. clean => cleaned
8. fly => flew 16. help => helped
1. study -> studied
2. go -> went
3. play -> played
4. learn -> learnt / learned
5. swim ->swam
6. eat -> ate
7. talk -> talked
8. fly -> flew
9. have -> had
10. ride -> rode
11. stay -> stayed
12. watch -> watched
13. see -> sew
14. water -> watered
15. clean -> cleaned
16. help -> helped
chuyển các từ sang dạng quá khứ
1.study => studyed
2.go => went
3.play => played
4.learn => learned
5.swim => swam
6.eat => ate
7.talk => talked
8.fly => flew
9. have => had
10.ride => rode
11.stay => stayed
12.watch => watched
13.see => saw
14.water =>watered
15.clean =>cleaned
16.help => helped
