Usages of ao
Gosto tanto de café como de chá ao pequeno-almoço.
I like both coffee and tea at breakfast.
A avenida fica cheia ao fim da tarde.
The avenue gets crowded in the late afternoon.
Eu gosto de olhar para o mar ao pôr-do-sol.
I like to look at the sea at sunset.
Elon.io is an online learning platform
We have an entire course teaching Portuguese grammar and vocabulary.