不用,
如果兩個(gè)（或者更多）動(dòng)詞,都是謂語動(dòng)詞,而且是用對等連接詞所連接起來,那就全部都用過去式,例如：
They sang and danced and had a good time at the party.
如果謂語動(dòng)詞只有一個(gè),而其他的動(dòng)詞可能就有其他的限制,變化了.例如：
He told me to clean the kitchen yesterday.其中,謂語動(dòng)詞是told,而 to clean 是賓語補(bǔ)足語,是以不定式的形式出現(xiàn)的.
They were swimming in the pool.這個(gè)句子是過去進(jìn)行式（也算廣義的過去式）,要改成過去式的只有be動(dòng)詞,而后面的游泳,是必須以現(xiàn)在分詞的形式出現(xiàn)的.
He told me that he had a part-time job at a restaurant.這個(gè)句子,主句和從句都有自己的謂語動(dòng)詞,同時(shí)以過去式形式出現(xiàn).
其實(shí)這些變化,不一而足,我只能舉些不同的情形當(dāng)例子,