21 Heb “I know.”
22 Heb “for them”; the referent (people, i.e., mankind) has been specified in the translation for clarity.
23 Qoheleth uses the exceptive particle אִם … כִּי (ki …’ im, “except”) to identify the only exception to the futility within man’s life ( 474 כִּי 2).
24 Heb “to do good.” The phrase לַעֲשׂוֹת טוֹב (la’asot tov) functions idiomatically for “to experience [or see] happiness [or joy].” The verb עָשַׂה (’asah) probably denotes “to acquire; to obtain” ( 795 עָשַׂה II.7), and טוֹב (tov) means “good; pleasure; happiness,” e.g., Eccl 2:24; 3:13; 5:17 ( 375 טוֹב 1).

In other versions

I perceived that there is nothing better for them than to be joyful and to do good as long as they live;

I know that there is nothing better for people than to be happy and to do good while they live.

I know that there is nothing better for them than to rejoice and enjoy the good life.

So I concluded there is nothing better than to be happy and enjoy ourselves as long as we can.

So I realized that there is nothing better for them than to rejoice and enjoy themselves during their lives.

I know that there is no good in them, but for a man to rejoice, and to do good in his life.

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