如果你不去学习， 则不会取得好成绩。

Rú guǒ nǐ bù qù xué xí, zé bù huì qǔ dé hǎo chéng jì.

If you don't study, then you won't achieve good grades.

他说他会来， 则他一定会来。

Tā shuō tā huì lái, zé tā yī dìng huì lái.

He said he would come, so he will definitely come.

如果天气好， 则我们可以去公园玩。

Rú guǒ tiān qì hǎo, zé wǒ men kě yǐ qù gōng yuán wán.

If the weather is good, then we can go to the park to play.