i don"t allow__here.those who smoke are not allowed__here(smoking:to smoke)为什么不填to smoke:smoking?请问后面一问为什么不用smoking呢?

i don"t allow__here.those who smoke are not allowed__here(smoking:to smoke)为什么不填to smoke:smoking?请问后面一问为什么不用smoking呢?
i don"t allow__here.those who smoke are not allowed__here(smoking:to smoke)
为什么不填to smoke:smoking?
请问后面一问为什么不用smoking呢?

i don"t allow__here.those who smoke are not allowed__here(smoking:to smoke)为什么不填to smoke:smoking?请问后面一问为什么不用smoking呢?
To smoke 是动词啊 ,这里面 吸烟是被当成名词一样使用
一般动词加ING 要麼变成在进行式 ,要麼就变成 名词
而且allow已经是一个动词了 ,你需要 subject+verb+object= complete sentence

allow doing sth 允许做某事