应该这样
cost costing costed
live living lived
do doing did
play playing played
answer answering answered
cry crying cried
leave leaving left
chat chatting chatted
write writing wrote
search searching searched
应该这样
cost costing costed
live living lived
do doing did
play playing played
answer answering answered
cry crying cried
leave leaving left
chat chatting chatted
write writing wrote
search searching searched