The verb governs (makes) the sentence.
Marcus studiat.
The verb “studiat” needs a subject > Marcus
Marcus amicum videt.
The verb “videt” needs a subject > Marcus and an accusative object > amicum
Marcus bonum amicum videt.
The noun “amicum” needs an adjective attribute > bonum
Marcus amico consilium dat.
The verb “dat” needs a subject > Marcus, a dative object > amico and an accusative object > consilium
Marcus ad amicum vadet.
The adverbial “ad amicum” is added to the sentence “Marcus ... vadet.”.
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