Use 'come across' to describe an unexpected discovery, like finding an item or person when you weren't actively looking.

Chance Encounter

'Come across' often implies a casual or surprising nature of a meeting without prior arrangement.

Unplanned Meeting

Use 'come across as' to describe the impression someone makes on others, often upon first interaction.

Sometimes, people don't mean to give an impression that they 'come across as' unintentionally.

'Come across with' is used when someone complies with a request, especially after some hesitation.

'Come across with' has a less formal tone and is often used in casual or spoken English.

In a physical space, 'come across' describes moving from one side to another, often taking a direct path.

When using 'come across' to talk about movement, it helps to visualize the space being crossed.