Help me with my code

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C++14

i have a post-lab question at the university
and i tried to write the code but it did not work

this is my post-lab question:

Plural Form of Nouns

In the English language, nouns are inflected by grammatical number — that is singular or plural. In this problem we use a simple model of constructing plural from a singular form.

This model doesn't always make English plural forms correctly, but it works in most cases. Forget about the real rules you know while solving the problem and use the statement as a formal document.

You are given several nouns in a singular form and your program should translate them into plural form using the following rules:

· If a singular noun ends with ch, x, s, o the plural is formed by adding es. For example, witch-> witches, tomato-> tomatoes.

· If a singular noun ends with f or fe, the plural form ends with ves. For example, leaf-> leaves, knife-> knives. Pay attention to the letter f becoming v.

· Nouns ending with y change the ending to ies in plural. For example, family-> families.

· In all other cases plural is formed by adding s. For example, book->books.


Input (READ from a file)

Read from the file (file1.txt) many words. A word consists from 2 to 25 lowercase Latin letters. It is not guaranteed that the given words are real English words from vocabulary.

Output (WRITE into a file)

Print n given words in their plural forms on separate lines on a file. Keep the words in the same order as they are given in the input.

What I have tried:

i start to write it like so

#include <iostream>
#include <string>
#include <fstream>
using namespace std;


int main(){
	string singular;
	ifstream writing;
	ifstream reading;
	writing.open("singular.txt");

	while (!writing.eof())
	{
	cin>>singular;
		writing>>singular;
		for(int i=0;i<singular.length();i++)
			if (singular[i]>='a' && singular[i]<='z')
				continue;
			else 
			break;

			if (singular.length()-1=='o' || singular.length()-1=='x' || singular.length()-1=='s' )
				writing>>singular+"es\n";
			else if ( singular.length()-1=='f')
				writing>>singular+"ves\n";
			else if (singular.length()-2=='ch')
				writing>>singular+"es\n";
			else if (singular.length()-2=='fe')
			{	writing>>singular+"ves\n";
			writing>>singular.erase(singular.length()-1)+"ies\n";}

     		else if ( singular.length()-1=='y')
				
				writing>>singular.erase(singular.length()-1)+"ies\n";
			else
				writing>>singular+"s\n";

	}
	
	
writing.close();
return 0;}