Problem with if statement with multiple or conditionals

[mRBLITZ]

I am trying to write a program that will perform a grammar check on a very limited customized language of english with japanese suffixes.

I am having trouble understand why I repeatedly get "it is ungrammatical" even though I am inputting man-ga caught fish as my sentence. Every other part works fine up till this part and the code that checks the suffixes also works if the if statement is deleted.

  //Check if the base of 1st word is one of the nouns, if not ungrammatical

  if(w1base != "man" || w1base != "woman" || w1base != "fish")
 {
     cout << "Your input is not grammatical Eng++";
     return 0;
 }
 // Reset i=0 to cycle through the 2nd word and marker
 i=0;
 // w1Mark is now something after the dash check if it is not -ga  declare un grammatical
 while (w1Mark != "-ga")
 {
     cout << "Your input is not grammatical Eng++";
     return 0;
 }


}

[pnoid]

A man is not a woman or a fish.
Think about it.

Your if statement will always be true as long as w1base isn't "man", "woman", and "fish" at the same time.