过去式和过去分词的问题

entered visited watched wanted invited dreamed sent enjoyed studied stopped（过去分词同）
在形式上几乎是相同的，但个别词二者不同。用法上，过去式是在过去时态的句子中充当谓语的，而过去分词在句中可能作状语等。

enter entered entered
visit visited visited
watch watched watched
want wanted wanted
invite invited invited (邀请的意思）
dream dreamed dreamed
send sent sent
enjoy enjoyed enjoyed
study studied studied
stop stopped stopped
过去式是动词的过去时态，即动词的过去形式，通常都是加ed.但有些是不规则动词。要背的。过去分词是指过去某段时间正在发生的动作

enter entered entered 进入
visit visited visited 参观
watch watched watched 看,观看

want wanted wanted 要，想要

invite invited invited 邀请

dream dreamed dreamed
send sent sent
enjoy enjoyed enjoyed
study studied studied
stop stopped stopped

过去式是动词的过去时态,英语跟中文不同，如果表示过去发生的事要用过去式，不像中文，现在和过去,将来都是用同样一个动词.
过去分词主要用于完成时,和被动时态中,完成时是have/has/had+过去分词,表示状态,做了什么事,被动式是be+过去分词,表示……被做

invite 邀请
过去时 过去分词
enter entered ent