That is my grandfather. Or That is my grandpa.
"This is my grandpa" or "This is my grandfather".
The common English expression for "It is my grandfather" is "It is my grandfather." Or "He is my grandfather."
The following is an English essay about Grandpa: I have a great grandfather. He is very old but still healthy. He likes to tell me stories. His face is full of wrinkles which show his long life. I love him very much.
The following are two English essays about "My Grandpa" and their translation: [Essay 1:] My grandfather is over sixty now, but he is in good health, and his hair is still black. He is tall and handsome, and looks like a gentleman. He is very kind to me. Believe it or not, he began to learn to drive last year, and now he drives his white Nissan every day. My grandfather has taught English for about 35 years, and he has been to many countries, such as America, France and Canada. Now he is on holiday in Europe with my grandmother. My grandfather is now in his sixties, but he is in good health and his hair is still black. He was tall, handsome, and looked like a gentleman. He was very good to me. Believe it or not, he started learning how to drive last year and now drives his white Nirvana every day. My grandfather taught English for about 35 years. He has been to many countries, such as the United States, France, and Canada. He's on vacation in Europe with my grandma. [Essay 2:] I have a nice grandfather. He is eighty years old. Although he is eighty years old, his body is still in good condition. He likes to listen to Beijing Opera. He often goes to do exercise, so many people ask him about Opera. He has a nice wife that is my grandmother. Grandfather is a good husband, and also is my good grandfather. His favorite color is red, because he thinks red stands for joyousness. I love my grandfather forever. Translator: I have a good grandfather. He is eighty years old. Although he was eighty years old, he was still in good health. He liked to listen to Beijing opera and often went to exercise, so many people would ask him about Beijing opera. He had a good wife, my grandmother. Grandpa is a good husband and a good grandfather to me. His favorite color was red because he thought red represented happiness. I will always love my grandfather.