Use the proper article:a) One morning ... little boy is sitting

a) One morning a little boy is sitting in the bus on his way to the school. He's sniffing all time and making such a noise with his nose that other people in the bus begin to shake their heads. At last gentleman who's sitting next to him says: "a little boy, haven't you got a handkerchief?" "Yes, I've got a clean handkerchief in my pocket," says a little boy, "but I can't let you have it. My mother says it's not polite to ask anybody for a handkerchief. You must use your own."

b) The Englishman and the American were taking their dinner at one table without being introduced to one another. During a meal the American asked the Englishman to pass him a salt. "Here's a waiter, sir", replied sternly v. Englishman. "Oh, I beg your pardon, I was mistaken," said the American. "What? You were mistaken, sir, you took me for a waiter?" "Oh, no", answered the American. "I considered you gentleman".

c) Waitress: Some coffee, an orange juice, an egg sandwich and a cheese sandwich. You: Thank you. Some coffee and an egg sandwich are for me, an orange juice and a cheese sandwich are for my friend.

d) Teacher. Are these your things, Peter? A pen, The English dictionary, a notebook, a camera and a bag. Peter: a camera and a bag are mine, but not a pen, the dictionary, or a notebook.

Use the proper article:

a) One morning a little boy is sitting in the bus on his way to the school. He's sniffing all  time and making such a noise with his nose that  other people in the bus begin to shake their heads. At last  gentleman who's sitting next to him says: "a little boy, haven't you got a handkerchief?" "Yes, I've got a clean handkerchief in my pocket," says a little boy, "but I can't let you have it. My mother says it's not polite to ask anybody for a handkerchief. You must use your own."

b) The Englishman and the American were taking their dinner at one table without being introduced to one another. During a meal the American asked the Englishman to pass him a salt. "Here's a waiter, sir", replied sternly v. Englishman. "Oh, I beg your pardon, I was mistaken," said the American. "What? You were mistaken, sir, you took me for a waiter?" "Oh, no", answered the American. "I considered you  gentleman".

c) Waitress: Some coffee, an orange juice, an egg sandwich and a cheese sandwich. You: Thank you. Some coffee and an egg sandwich are for me, an orange juice and a cheese sandwich are for my friend.

d) Teacher. Are these your things, Peter? A pen, The English dictionary, a notebook, a camera and a bag. Peter: a camera and a bag are mine, but not a pen, the dictionary, or a notebook.