以前の習慣⇔昔を懐かしむ

”used to.....”　以前の習慣を伝える

動作◎   I used to play golf.

状態◎　I used to be shy.

”would+頻度”　昔していたことを懐かしむ

When I was young, a sightseeing(tour) bus/ a roller coaster would sometimes make me get car sick.

動作◎   My grandmother would always wear Japanese kimono. 

状態×   I would be shy.