how is your father i haven't seen him for a ling time ,为什么要用haven't

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how is your father i haven't seen him for a ling time ,为什么要用haven't
how is your father i haven't seen him for a ling time ,为什么要用haven't

how is your father i haven't seen him for a ling time ,为什么要用haven't
这里用的是现在完成时
have done是现在完成时的句型
意思为我已经有很长时间没看到他了
祝你学习进步,更上一层楼!(*^__^*)