swim,have和study的过去式是什么

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swim,have和study的过去式是什么swim,have和study的过去式是什么swim,have和study的过去式是什么swim---swam这个是不规则变化,要记住have---had这

swim,have和study的过去式是什么
swim,have和study的过去式是什么

swim,have和study的过去式是什么
swim---swam这个是不规则变化,要记住
have---had 这个也是不规则变化
study--studied 改y为i再加ed

swam
had
studied

swam had studied

swam had studied