allow sb to do sth allow doing sth be allowed to do sth
A: allow 的用法 1)allow作“允许”或“许可”讲，常搭用动词不定式短语作宾语补足语即，allow sb. to do sth.允许某人做某事 ①Please allow me to carry your bag. 请让我替你拿包。
②My boss doesn't allow me to use the telephone. 我的老板不允许我用电话。
③We were allowed to smoke in this room only. 我们只许在这间屋子里抽烟。
2)allow 作“许可”，“允许”讲，只可搭配动名词短语作宾语，不可直接搭用动词不定式作宾补，即只可说 allow doing sth., 不可说allow to do sth. ①They allowed smoking in this room only. 他们只允许在这间屋子里抽烟。
②Smoking is not allowed here. 此处禁止吸烟。
3)allow还常与 out, in, up等副词搭配使用，即 allow sb. in/out/up等。
①She won't allow the children in until they've wiped their shoes. 直到孩子们把鞋擦干净，她才让他们进来。
②She is not allowed out after dark. 天黑后，不准她出去。
③The patient was allowed up after ten days. 十天后病人才被允许起床(下地)。
【注意】下面的独立主格结构，表示条件 Circumstances allowing, we shall further improve out farming method.(即 If circumstances allow, we shall further improve our farming method.)如果情况许可的话，我们将进一步改进工作方法。
