Present Perfect Present Perfect TenseTense1Present perfect tense 现在完成时现在完成时v构成:v用法一：表示过去发生的某一动作对现在造成的影响或产生的结 果.现在完成时这一时态强调是过去动作与现在的联系,也就是强调现在的影响和结果.have/has+过去分词2动词的过去分词：动词的过去分词：规则变化（和过去时一样）规则变化（和过去时一样）不规则变化（特殊记）不规则变化（特殊记）3不规则变化：不规则变化：am/is-was-been are-were-been begin-began-begun break-broke-broken do-did-done draw-drew-drawn drink-drank-drunk drive-drove-driven eat-ate-eaten fall-fell-fallen fly-flew-flown forget-forgot-forgotten give-gave-given go-went-gone grow-grew-grown hide-hid-hidden kno
