谁能告诉我过去将来完成进行时的肯定句、否定句、疑问句结构？帮个忙吧。。。。。。
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过去将来完成进行时的肯定句: sb would have been doing sth
过去将来完成进行时的否定句: sb wouldn't have been doing sth
过去将来完成进行时的疑问句结构: Would sb have been doing sth?
过去将来完成进行时的否定句: sb wouldn't have been doing sth
过去将来完成进行时的疑问句结构: Would sb have been doing sth?
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