Meaning of ことがない in Japanese

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Definition of ことがない

ことがない(kotoganai) 【事が無い】

(exp, adj-i) (something) has never occurred; to have never done (something); such a thing has not happened
never happens; there is never a time when

Ah, now I remember. I used a condom; something I rarely, or rather practically never, do.

My grandfather has never consulted a doctor in his life.

いままでに日光に行ったことがない。

I have never been to Nikko.

あんな愚か者おろかものにはついぞ会ったことがない。

Never did I see such a fool.

あんなに大きなおおきな鯨くじらを見たことがない。

Never have I seen such a big whale.

あんなに早口はやくちで英語が話せるのを聞いたことがない。

I've never heard English spoken so quickly.

You've never seen a genuine diamond.

You've never been to Paris?

As if you could kill time without injuring eternity.

かつて一度もいちどもこんな大だい群衆を見たことがない。

Never have I seen such a crowd of people.