Use the present perfect subjunctive to describe a supposed act of reading that one doubts or denies has happened at any point in the past.  This verb form consists of the conjugated helping verb, "haber," and the singular past participle of the word "leer." Example: "I doubt that she has read that book," Dudo que ella haya leído ese libro.  yo: haya leído tú: hayas leído él/ella/usted: haya leído nosotros/-as: hayamos leído vosotros/-as: hayáis leído ellos/ellas/ustedes: hayan leído The past perfect subjunctive should be used to describe a supposed act of reading that one doubts or denies has been done at a fixed point in the past.  This verb form consists of the conjugated helping verb, "haber," and the singular past participle of the word "leer." Example: "I doubt that he had read the newspaper," Dudo que él hubiera leído el periódico.  yo: hubiera leído tú: hubieras leído él/ella/usted: hubiera leído nosotros/-as: hubiéramos leído vosotros/-as: hubierais leído ellos/ellas/ustedes: hubieran leído Use the future perfect subjunctive to describe an act of reading that one doubts or denies will have happened.  This verb form consists of the conjugated helping verb, "haber," and the singular past participle of the word "leer." Example: "I doubt that I would have read that book if you did not recommend it," Dudo que yo hubiere leído ese libro si no lo recomiendo.  yo: hubiere leído tú: hubieres leído él/ella/usted: hubiere leído nosotros/-as: hubiéremos leído vosotros/-as: hubiereis leído ellos/ellas/ustedes: hubieren leído

TL;DR in Chinese:
Leer的虚拟式现在完成时变位。 Leer的虚拟式过去完成时变位。 Leer的虚拟式将来完成时变位。