没有得到老师的许可，学生不能提前离开教室。

Méiyǒu dédào lǎoshī de xǔkě, xuéshēng bù néng tíqián líkāi jiàoshì.

Without the teacher’s permission, students cannot leave the classroom early.

只有得到土地使用许可，才能开始建设工程。

Zhǐyǒu dédào tǔdì shǐyòng xǔkě, cáinéng kāishǐ jiànshè gōngchéng.

Only after obtaining land-use permission can the construction project begin.

这款软件需要得到官方许可才能在国内销售。

Zhè kuǎn ruǎnjiàn xūyào dédào guānfāng xǔkě cáinéng zài guónèi xiāoshòu.

This software needs official approval before it can be sold domestically.