<prompt> U-Engels wasungula lokho manje okwaziwa ngokuthi yi-Marxist theory kanye noKarl Marx futhi ngo-1845 washicilela i-The Condition of the Working Class in England, ngokusekelwe ekuboneni kwakhe siqu kanye nocwaningo emadolobheni aseNgilandi. Ngo-1848, u-Engels wabhala i-Communist Manifesto noMarx futhi wabhala futhi wabhala ikakhulukazi noMarx eminye imisebenzi eminingi. Kamuva, u-Engels wasekela uMarx ngokwezezimali, emvumela ukuba acwaninge futhi abhale i-Das Kapital. Ngemva kokufa kukaMarx, u-Engels wahlela imiqulu yesibili neyesithathu ye-Das Kapital. Ngaphezu kwalokho, u-Engels wahlela amanothi kaMarx kumaTheories of Surplus Value, awashicilela kamuva ngokuthi umqulu wesine we-Capital. Ngo-1884, washicilela i-Origin of the Family, Private Property kanye ne-State ngesisekelo socwaningo lukaMarx lwe-Ethnographic Question. Ubani owaziwa ukuthi wahlela imiqulu emibili eyengeziwe ye-  <response>: U-Engels 