throw就是动词原形,意思是“投,掷,抛,扔”,其过去式形式是threw,过去分词形式是thrown,例如:
I never throw anything away. 我从来不扔任何东西(摘自《柯林斯英汉双解大词典》)(本句是一般现在时,所以throw是动词原形)
I threw it in the trash. 我把它扔进了垃圾桶(摘自《柯林斯英汉双解大词典》)(本句中,threw是throw的过去式)
The old chair should be thrown away. 那把旧椅子应该扔掉了(摘自《牛津词典》)(本句是被动语态,所以thrown是throw的过去分词)