I advised him
Ich riet ihm ab, schwimmen zu gehen, da es nach Regen aussah.
I advised him not to go swimming because it looked like rain.
Ich riet ihm, das Geheimnis für sich zu behalten.
I advised him to keep the secret.
Ich riet ihm, sofort zurückzukommen.
I advised him to come back immediately.
I advised him to stay.
Ich riet ihm, nicht zu fahren.
I advised him not to go.