Answers

2014-09-22T22:11:05+08:00
We use it if the verb is pas/pastense like"
word   present    past         
use     using        used
beat   beating     beated
litter   littering   littered
 care  caring      cared
bake  baking      bake
walk  walking    walked   

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2014-09-23T10:14:11+08:00
When we are saying the words or it can be when we were turning present to past...the uses  of /d/ is to complete the word for clearly understand the word
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