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Mayor Bill de Blasio did the right thing Sunday evening, announcing that most city schools would close for weeks.

This will mean added challenges for parents who absolutely have to go in to work: It’s on the rest of us to help them out.

It’s not just health-care professionals, but also police, sanitation workers, technicians who keep the lights on and the sewers flowing, as well as the staffers who keep grocery-store shelves stocked.

Some may have a spouse who can hold down the fort. Others will send their kids to one of the school buildings that will stay open for the children of essential workers. But many will need help from a neighbor.

Yes, “social distancing” requires all of us to minimize contacts with others to reduce coronavirus spread. But that rule isn’t a suicide pact: It’s fine to be on-call for the teen who’s home alone next door, or even to take in your neighbor’s toddler while she’s off helping society function.

To help kids do online learning, Charter Communications, the parent of Spectrum cable, will give two months’ free broadband and Wi-Fi for every student K-to-college who doesn’t already have it. Other companies will step up to let some learning continue.

All the rest of us need to step up, too. Even though we’re supposed to avoid unnecessary contact, we’re all in this together.