%%

[t]+

is   |

am   |

are  |

was  |

were {printf("%s: is a verb",yytext);}

[a-zA-Z]+ {printf("%s: is a verb",yytext);}

. |n

%%

int main(int argc, char *argv[]){
    yyin = fopen(argv[1], "r");
    yylex();
    fclose(yyin);
}