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（动词过去式）
climbed
flew
had
rode
walked
took
climb
fly
have/has
ride
walk
take
when we talk about the past(过去)
climbed
flew
had
rode
walked
took
The past forms of verbs
How to change verbs into past forms?
The past forms
of verbs
climbed
walked
regular verbs
规则动词
irregular verbs
不规则动词