"like to fly" vs "like flying" ; "did you ever" vs "have you ever"

"like to fly" vs "like flying"
http://groups.google.com/group/alt.usage.english/browse_thread/thread/504f4f956230629d

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"did you ever" vs "have you ever"
http://groups.google.com/group/alt.usage.english/browse_thread/thread/f95c2bfd9ea8d259#