Yes, "that" is the correct word. )
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Grammar GeekYes, "that" is the correct word. (I would omit the "to" before "paint" however.)Hello GG,
CalifJimIt's not required, but the omission leaves out the idea that 'they' were the recipients of the help because 'they' were doing the painting and decorating.Just
Otherwise, you could imagine a different situation, such as
They have moved into a flat that we helped the building owner (to) paint and decorate.
CJ
CalifJimWe don't have flats in the U.S., so I'm not familiar with the system.I assumed that a building o