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13.doauxv.&v.→(单三式)→(过去式)14.havev.→(单三式)→(过去式)15.gov.去;走→(单三式)→(过去式)

题目详情

13. do auxv. & v. → (单三式) → (过去式)

14. have v. → (单三式) → (过去式)

15. go v.去;走 → (单三式) → (过去式)

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答案和解析

13. does did   14. has had   15. goes went