«فالأولى موضوعة لإفادة الحدوث في زمن مخصوص مع الاختصار»
The first type, the verbal sentence, is suited to conveying an event's occurrence within a particular time, concisely.
“دَخَلَ المُعَلِّمُ”
“The teacher entered.”
The entry is located in the past.
“يَدْخُلُ المُعَلِّمُ”
“The teacher enters/is entering.”
The present-form verb is interpreted by context and may express renewal or continuation in suitable settings.
This is a characteristic rhetorical tendency; tense, aspect and specific meaning still require attention to verbal form and context.