He looked into the situation - Ele investigou a situação
Prepositional verbs are very similar to phrasal verbs because the preposition affects the meaning of the verb. However, it is not part of the verb:
Different from phrasal verbs, prepositional verbs cannot be split. :
I will ask for his help.
I will ask his help for.
The situation resulted in violence.
The situation resulted violence in.
In some cases, the same verb can be combined with different prepositions:
Please, look after the dog. (take care) I'll look into the situation. (investigate)
Barbara doesn't really care about her boyfriend. (think something/someone is important or relevant) He cared for the baby. (look after; protect)