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When schools reopen in England in September, the government wants teachers to keep classes or whole year groups apart in separate "bubbles".
New guidance has been published for England. Others parts of the UK will have their own rules.
Who will be expected to go back?
Nearly all children of legal school age will be expected to return to class full-time in September, says the government - which wants to "start to reverse the enormous costs of missed education".
Attendance will be mandatory again from the beginning of the autumn term. Head teachers will be told to follow up pupils' absence and issue sanctions, including fines, in some cases.
Which children won't be back in class?
Pupils who are self-isolating will not be required to attend.
This will be because they have had symptoms or a positive test result themselves - or because they are a close contact of someone who has Covid-19.
Children who have been shielding, because they or someone in the household are clinically extremely vulnerable, will be expected to go to school in September.
Shielding advice for adults and children is due to pause in England on 1 August - subject to a continued decline in the rates of community transmission of the virus.
If rates of the disease rise in a local area, children (or their family members) will be advised to shield once again - but only while local rates remain high.
Some children who are not shielding, but who remain under the care of a specialist health professional, should discuss their ongoing care before September.
Schools are expected to offer remote learning to children unable to attend class because they are self-isolating or temporarily shielding.