1. allow (doing) sth 允许(做)某事。如：The facts allow no other explanation. 事实不允许有其他的解释。We don’t allow eating in the classrooms. (我们)We don’t allow eating in the class不允许在教室吃饭。注：有时用于被动语态。如：Dogs are not allowed. 狗不得入内。Smoking is not allowed here. 此处不准吸烟。
2. allow sb to do sth 允许某人做某事。如：My parents don’t allow me to go out at night. 我父母不允许我晚上出去。Her boss doesn’t allow her to use the telephone. 她的老板不允许她使用电话。
注：有时用于被动语态。如：Passengers are not allowed to smoke. 乘客不准吸烟。
3. allow sb sth 给予某人某物(尤指钱或时间)；让某人有(拥用或带有)某物。如：某物。如：He allows his son too much money. 他给他儿子的钱太多。We’ll allow you time to answer. 我们将给回答的时间。I will allow you 10% off the price if you pay now. 如果你现在付款，我可以给你打九折。We allow passengers one item of hand luggage each. 我们允许每个乘客带一件手提行李。注：有时用于被动语态。如：I’m not allowed visitors. 我不准有访客。
4. allow for 考虑到，把……考虑进来，体谅。如：……We should allow for every possible delay. 我们考虑到任何可能的延误。
We must allow for his youth. 我们必须体谅他的年轻。