1. P18 XI
Formal, direct, 因为你是上司；1-（3-2）
To: all staff
From:
Date:
Subject: notice of housecleaning
C.c.
Dear all:
Please note that due to hygienic reason/consideration, housekeeping will take place at 时间（复习）.
We strongly recommend that all staff should take action on heir remaining food in the refrigerator accordingly as everything will be discarded by then. Thanks you Regards
Mike
Office Director
formal的建议句型，前面的那个是比较less formal：
a. we suggest/recommend that
b. it’s necessary that
d. it’s helpful that
e. it seems that you should
f. You really ought to
p18 X
direct, formal; 1-2-3