【题目】写出下列单词的过去式。
1. am；is__________ 2. take__________ 3. visit _________
4. play_____________ 5. have __________ 6. make __________
7. are _________ 8. go _________ 9. do_________ 10. learn__________
【答案】1. was2. took3. visited4. played5. had6. made7. were8. went9. did10. learnt
【解析】
略