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

①We were allowed to smoke in this room only.

我们只许在这间屋子里抽烟.

②Please allow me to carry your bag.

请让我替你拿包.

③My boss doesn't allow me to use the telephone.

我的老板不允许我用电话.

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.

①Smoking is not allowed here.

此处禁止吸烟.

②They allowed smoking in this room only.

他们只允许在这间屋子里抽烟.

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.