we don't know when we will have the school trip = we don't know when ___ ___the school trip

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wedon''tknowwhenwewillhavetheschooltrip=wedon''tknowwhen______theschooltripwedon''tknowwhenwewillhaveth

we don't know when we will have the school trip = we don't know when ___ ___the school trip
we don't know when we will have the school trip = we don't know when ___ ___the school trip

we don't know when we will have the school trip = we don't know when ___ ___the school trip
to have

have?