九年级新目标（go for it ）－ Unit 2。I used to be afraid of the dark .

(Section A.1a)

1. used to do sth “过去常常”（表过去习惯性动作或状态，暗示现在已不再如此，既可作情态动词，又可作实义动词。）e.g. He used to go swimming on Sundays ,didn’t / usedn’t he ? ( 反义疑问 )

否定式：used not to do 或didn’t use to do 

e.g. He used not to play basketball .= He didn’t use to play basketball.（他以前不打篮球