Se houver qualquer problema, a reunião pode ser remarcada para amanhã.

If there is any problem, the meeting may be rescheduled for tomorrow.

Breakdown of Se houver qualquer problema, a reunião pode ser remarcada para amanhã.

• amanhã: tomorrow
• se: if
• para: for
• o problema: the problem

Questions & Answers about Se houver qualquer problema, a reunião pode ser remarcada para amanhã.

Why is it houver and not há or tem?

Houver is the future subjunctive form of haver.

After se when you mean if in a real future possibility, Portuguese often uses the future subjunctive:

• Se houver qualquer problema... = If there is / If there should be any problem...

Compare:

• Há um problema. = There is a problem.
• Tem um problema. = There is a problem. (common in spoken Brazilian Portuguese)
• Se houver um problema... = If there is a problem...

So há is present indicative, and tem is a common spoken alternative, but houver is the form that fits this conditional structure in more standard Portuguese.

What exactly is houver the form of?

It comes from the verb haver.

In this sentence, haver means to exist / to be in the sense of there is/there are.

Its future subjunctive forms are:

• se eu houver
• se você/ele/ela houver
• se nós houvermos
• se vocês/eles/elas houverem

In the sentence:

• Se houver qualquer problema...

there is no explicit subject like ele or você because haver here is being used impersonally, meaning if there is.

Why is haver singular here, even though qualquer problema could mean any problem?