Resposta :
Os artigos/quantificadores indefinidos já estão nas frases, então vou apenas destacáhlos:
2.1- I have AN english dictionary.
2.2-I have AN apple for you today.
2.3-Do you have ANY red and black pens?
2.4- I want A red pen.
2.5- I want SOME black pens.
2.1- I have AN english dictionary.
2.2-I have AN apple for you today.
2.3-Do you have ANY red and black pens?
2.4- I want A red pen.
2.5- I want SOME black pens.