This is an irregular verb.
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In contemporary Portuguese, haver is mostly used impersonally in the 3rd-person singular forms há (present), havia (imperfect), and houve (preterite) to mean there is/are/was/were, or with há + time, ago.
In European Portuguese, haver is widely used in both spoken and written language. Forms like há, houvesse, and haveria are common and natural, even in everyday speech (e.g., há muita gente, Queria que houvesse mais tempo, Haveria muitas vantagens).
In Brazilian Portuguese, ter is much more common in everyday speech. Forms like tem, tivesse, and teria are typically used instead of há, houvesse, and haveria (e.g., tem muita gente, Queria que tivesse mais tempo, Teria muitas vantagens).
PresentPresentePresente
Há um problema no sistema.
There is a problem with the system.
Cheguei há duas horas.
I arrived two hours ago.
PreteritePretérito perfeitoPretérito perfeito
Houve um acidente ontem.
There was an accident yesterday.
ImperfectPretérito imperfeitoPretérito imperfeito
Havia muitos alunos na sala de aula.
There were many students in the classroom.
Imperfect SubjunctivePretérito imperfeito do subjuntivoPretérito imperfeito do conjuntivo
Queria que houvesse mais tempo.
I wish there were more time.
ConditionalFuturo do pretéritoCondicional
Haveria muitas vantagens nessa solução.
There would be many advantages to that solution.