from的用法

    from用作介词，用来表示做为起点的特定地点或时间，有从...起，从...来，免掉，因为等含义。可用来指定来源、起因、方法或用具。

    1.从...起，始于

    She is singing from morning to night.她从早唱到晚。

    2.从;由

    He rose from office boy to managing director in fifteen years.

    他十五年里从办公室勤杂员升到总经理。

    3.用来表示做为起点的特定地点或时间，

    walked home from the station

    从家走到车站

    4.从...来;出自

    He comes from Shanghai.他来自上海。

    5.表示去除、免掉、阻止、剥夺等

    The pill will relieve you from pain.这药丸将使你免受痛苦。

    6.表示区别、比较

    He is old enough to know right from wrong.他已长大,能够辨别是非了。

    7.由于：用来指定来源、起因、方法或用具：

    a note from the teacher

    老师写的条

    taking a book from the shelf.

    从架子上拿本书