عاداتُ الشُّعُوبِ فِي التَّرْحِيبِ بِفَصْلِ الرَّبِيعِPeoples' rituals to welcome spring

Definition
The imperfect, الْمُضَارِعُ, expresses an action that takes place in the present or in the future. The verb in the imperfect is always preceded by one of four letters: أ ـ نـ ـ يــ ـ تـ, called ‘the prefixes of the imperfect’, حُرُوفُ الْمُضَارَعَةِ. Ex. أَحْتَفِلُ ـ تَحْتَفِلُ ـ يَحْتَفِلُ ـ نَحْتَفِلُ

Declension
The imperfect takes the nominative case, الرَّفْعُ, when it is not preceded by one of the accusative case particles (أَنْ ـ لَنْ ـ لَمْ ـ كَيْ…). The nominative case marker in the imperfect is the ضَمَّة (in all forms of the imperfect, except the five verbs).
Ex. يَحْتَفِلُونَ