relative clause

可以一步步看這句哦：

what = 東西

what ''belongs to another'' = ''屬於別人的'' 東西

Keeping ''what belongs to another'' = Keep 住 ''屬於別人的東西''

''Keeping what belongs to another'' amounts to stealing = ''Keep 住屬於別人的東西'' 等於偷野


大多數情況: 先 identify 個 what-clause，然後拆散每部分，按 SVO 句法看就得了。

熟能生巧，加油。

Keeping what belongs to another amounts to stealing.
=Keeping the thing which belongs to another amounts to stealing.

完整文法觀念看這裡

(what belongs to another)=noun clause
amounts=be equal, be equivalent
what=quantity of presents, items, property having a value of possession; worth (adj) a value.
whatever=pronoun and adjective of What of it relevant to the question of relative clause that's worth a value=what.

what 代表什麼???
personals + presents + items + belongings etc.,