Sentence understanding 7....he got up and crept downstairs,careful of the creaky boards... He had to be careful so that the boards would not make any noise and wake up his father,thus spoiling his plan. 66 7. …he got up and crept downstairs, careful of the creaky boards… He had to be careful so that the boards would not make any noise and wake up his father, thus spoiling his plan. Sentence understanding