by subway的过去式
"by subway"是一个介词短语，本身没有过去式。如果要将句子中的动词转换成过去式，需要根据具体的句子语境来确定，例如： - I went to the museum by subway.（我坐地铁去博物馆了。）其中动词"go"的过去式为"went"。 - He usually travels by subway. Yesterday, he also went by subway.（他通常乘地铁出行。昨天他也是坐地铁去的...