Article: Use the present subjunctive when you need to describe an act of reading that is supposedly presently going on when one doubts or denies that it is actually going on.  Example: "I doubt that they read many books," Dudo que ellos lean muchos libros.  yo: lea tú: leas él/ella/usted: lea nosotros/-as: leamos vosotros/-as: leáis ellos/ellas/ustedes: lean The imperfect subjunctive is used to describe an act of seeing that one doubts or denies has happened in the past.  Note that there are two forms of the imperfect subjunctive for all six tenses of the conjugation. The verb leer is irregular in the imperfect subjunctive. Example: "I doubt that you read that book," Dudo que leyeras ese libro.  yo: leyera or leyese tú: leyeras or leyeses él/ella/usted: leyera or leyese nosotros/-as: leyéramos or leyésemos vosotros/-as: leyerais or leyeseis ellos/ellas/ustedes: leyeran or leyesen The verb leer is irregular in the future subjunctive. The future subjunctive should be used when you need to describe an act of reading that may happen in the future when one doubts that the act will actually happen.  Example: "I doubt that we will read that book," Dudo que leyéremos ese libro.  yo: leyere tú: leyeres él/ella/usted: leyere nosotros/-as: leyéremos vosotros/-as: leyereis ellos/ellas/ustedes: leyeren

What is a summary?
Conjugate leer in the present subjunctive. Learn the imperfect subjunctive. Use the future subjunctive.