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1·He who hesitates is lost.

迟疑者必有失。《新英汉大辞典》

2·I know that he who hesitates is lost.

我知道，犹豫者终难成事。

3·I know that he who hesitates is lost.

我知道，犹豫着终难成事。

4·Call that girl and ask her out. Call her right now. He who hesitates is lost.

打电话给那女孩，跟她约会，现在就打电话给她。踌躇不决者必然失败。