Im Präteritum funktioniert es, das Beispiel hatte ich ja schon gegeben. Aber in allen anderen Zeitformen eben nicht, ich habe es gerade noch mal durchprobiert.
OT: Ich muss gestehen, dass ich das Idiom mit dem Kuchen bisher immer so verstanden hatte, dass man sich zwischen zwei Ausdrucksweisen entscheiden muss - laut OED steht das "have" aber hier für "keep".
"8. Proverbs. you can't eat your cake and have it (see quots.). one's cake is dough: one's project has failed of success. every cake has its make, mate, or fellow (north. dial. and Sc.).
1562 J. Heywood Prov. & Epigr. (1867) 79 What man, I trow ye raue, Wolde ye bothe eate your cake, and haue your cake?
1563 T. Becon Displaying Popish Masse in Wks. III. f. xlviii, Or ells your Cake is dough & al your fatte lye in the fyre.
a1598 D. Fergusson Sc. Prov. (1641) sig. E3v, There never was a cake, but it had a make.
a1616 Shakespeare Taming of Shrew (1623) i. i. 108 Our cake's dough on both sides. Farewell.
1678 J. Ray Coll. Eng. Prov. 68 Every cake hath its make, but a scrape-cake hath two.
1687 E. Settle Refl. Dryden's Plays 4 She is sorry his cake is dough, and that he came not soon enough to speed.
1708 P. A. Motteux Wks. F. Rabelais iv. vi, You shall have rare Sport anon, if my Cake ben't Dough, and my Plot do but take.
1711 Ld. Shaftesbury Characteristicks (1737) I. 130 As ridiculous as the way of children, who eat their cake, and afterwards cry for it..They shou'd be told, as children, that they can't eat their cake, and have it.
1815 Duke of Wellington Let. 17 Aug. in Dispatches (1838) XII. 589 Our own government also..having got their cake, want both to eat it and keep it.
1861 C. Reade Cloister & Hearth I. xxi. 227 Dierich's forty years weighed him down like forty bullets. ‘Our cake is dough,’ he gasped.
1934 J. Farnol Winds of Fortune v. 31 Thy cake's dough, eh, Japhet; art cheated o' thy dear vengeance, lad!"
(Hervorhebung von mir).
Wieder was gelernt, danke, Dragon!