3.knew about
4.All in all
5.It difficult
四、1.Did see
2.there weren't
3.didn't do
4.did do
5.Why does
二、A
1.played visited climbed picked talked
2.lived hoped used loved liked
3.stopped dropped planned
4.studied worried carried tried cried
5. rode were had fed bought
B
1.规则变化，动词原形后+ed
2.以e结尾的动词过去式+d
3.重音在前，辅元辅结尾，双写+ed
4.以y结尾变y为i+ed
5.不规则变化
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