#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void sentence(void);
void np(void);
void vp(void);
void article(void);
void noun(void);
void verb(void);


int main(){
 int i;
 srand(time(NULL));
 for(i=1; i<=10; i++)
  {sentence(); printf("\n");}
 
 getchar();
 return 0;
}

void sentence(void){
 np();
 vp();
}

void np(void){
  article();
  noun();
}

void vp(void){
  verb();
  np();
}

void article(void){
  int x;
  x=1+rand()%3;
  switch (x){
    case 1: printf("a "); break;
    case 2: printf("an "); break;
    case 3: printf("the "); break;
  }
}

void noun(void){
  int x;
  x=1+rand()%3;
  switch (x){
    case 1: printf("boy "); break;
    case 2: printf("apple "); break;
    case 3: printf("ball "); break;
  }
}

void verb(void){
  int x;
  x=1+rand()%3;
  switch (x){
    case 1: printf("ate "); break;
    case 2: printf("hit "); break;
    case 3: printf("run "); break;
  }
}