count on (someone)(doing something)

To "count on" someone doing something means that you totally trust that they'll do it. You don't prepare for the possibility that they might not do it.

For example, if a person has spent all her money and doesn't have enough to pay for her rent on the 30th of the month, you could say:

She's counting on getting paid on the 25th.

That means that she strongly believes she'll get paid and doesn't have a plan for what to do if the payment doesn't come.

When the thing you're planning on is a person's action, you say "count on (someone)(doing something)":

Don't count on Sandra being available on Friday. She'll probably be busy then.

This phrase appears in these lessons: