To change "lento" to an adverb you can put "lentamente"
Me gusta estar en la casa
yo veo la televisión
Me encanta estudiar matemáticas
Yo Fui al restaurante
Si Antonio estuviera en la fiesta, el hablaria con Juan.
This sentence means - If Antonio had gone to the party, he would have talked to Juan.
It is a hypothetical sentence, meaning that it didn't happen but states what could have happened had he decided to go to the party.
Manejo rápidamente en __la autopista__.
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