可是英语

but,although,though,however,conversely,reversly,instead

though 是副词“不过,然而”的意思.你的理解是正确的. have been主语是The teachers ,后面的（that i have valued and enjoyed most of all,）是一个定语从句. 主要是该句子用了两个定语从句来表达的.

but 可是的意思

but,although,though,however,conversely,nevertheless

楼知你好。以下词都有可是的意思 but;yet;however;and yet;only望采纳谢谢

可[kě]动can; may; approve; need连（表示转折） but; yet副[书]about名（姓氏） a surname