Would you ever 的意思

Would you ever do it? => 你會這樣做嗎?
[Would] 表示意願, 有假設的含義.

Have you ever do it? => 你有這樣做過嗎?
[Have] 表示疑問, 指已經發生的事.

WOULD YOU EVER DO IT
你是可否試試這樣做？(有點建議的意味)

HAVE YOU EVER DO(en) IT
你是否曾經這樣做過？ (直接的詢問，只想你作答)

2007-10-05 17:47:58 補充：
WOULD YOU EVER DO IT你可否試試這樣做？(有點建議的意味)