Why you have done this?

Why did you have done this?

Why you had done this?

That shirt which he bought is blue in colour

The shirt that which he bought is blue in colour

Which shirt he bought is blue in colour

A letter was writing by Sheila

A letter was being writing by Sheila

A letter was been written by Sheila

One of my friends are a lawyer

One of my friend is a lawyer

One of my friends are lawyers

atmosphere

pollution

demography

introduction

preface

foreword

of the same place

of the same race

of the same density

to learn

to drink

to tinge

very dangerous

very pleasant

very ugly

a bazar

a mosque

a new country