Hindustani has 3 aspects: perfective, habitual, and progressive, each having overt morphological correlates. These are participle forms, inflecting for gender and number by way of a vowel termination, like adjectives. The perfective, though displaying a "number of irregularities and morphophonemic adjustments", is the simplest, being just the verb stem followed by the agreement vowel. The habitual forms from the imperfective participle; verb stem, plus -"t"-, then vowel. The continuous forms periphrastically through compounding (see below) with the perfective of rêhnā "to stay".