從詞來看
大部分的過去式和過去分詞是一個詞 少部分的不同
從用法來看
過去式是用于一般過去式 做謂語.
例：She went to school yesterday.
過去分詞：
1.用于完成時,與have和had分別構(gòu)成現(xiàn)在完成（進行 時和過去完成（進行）時,做謂語.
例：She has gone to school.
2.與be或should have等等構(gòu)成被動語態(tài).
例：He is beaten by his father.
3.非謂語動詞之一,表示被動,完成的意思,可作定語,表語,補語和狀語.
例：The boy beaten by his father is my friend.
beaten by his dad,he leave his home because of anger.