若其后直接跟動詞要用動名詞

Time doesn’t permit my waiting longer. 時間不允許我等得太久。

The rules of the club do not permit smoking. 這個俱樂部規定不準吸煙。

若其后先接賓語再跟動詞則要用不定式

His health does not permit him to come. 他的健康（狀況）不允許他來。

Her father would not permit her to eat sweets. 她父親不允許她吃糖果。

比較下面兩句

We don’t permit smoking in the lecture room. 我們不允許在大教室抽煙。

We don’t permit people to smoke in the lecture room. 我們不允許人們在大教室抽煙。