自學英語新概念第二冊第21課
文法：
被動語态：
一般現在時：am/is/are done
一般過去時：was/were done
現在進行時：am/is/are doing done
過去進行時：was/were doing done
現在完成時：have/has been done
過去完成時：had been done
情态動詞被動：現在時
will/would be done
may/might be done
can/could be done
must be done
have to be done
過去時：
must have been done
can not have been done
may have been done
短語：
be mad at sb
for some reason
be determined to do sth
offer sb sth=offer sth to sb
a large sum of
come into use
#英語#
