It is essential to learn verb haver (there to be) because:

1. It is an auxiliary verb which is part of a large number of compound tenses - in general, it can be used interchangeably with ter;

2. It is a highly irregular verb;

3. As a main verb, it means to exist, there to be;

4. When it means to exist, there to be, it is only used in the 3rd person singular of all tenses.

vocês

vocês