YOU SAID:

I've never seen a snake like this

INTO JAPANESE

私はこのようなヘビを見たことがないです。

BACK INTO ENGLISH

Not that I've seen this snake.

INTO JAPANESE

このヘビを見たことはないです。

BACK INTO ENGLISH

Have never seen this snake.

INTO JAPANESE

このヘビを見たことがないです。

BACK INTO ENGLISH

Never seen this snake.

INTO JAPANESE

このヘビを見たこと。

BACK INTO ENGLISH

Having seen this snake.

INTO JAPANESE

このヘビを見たこと。

BACK INTO ENGLISH

Having seen this snake.