If foreign students often study Mandarin online, they may frequently see many Chinese oral expressions such as 吹了and错不了. The former one is applied to indicate it is not successful or an unsuccessful love. For example, 甲：你们假期不是要出国旅游吗？乙：吹了，我丈夫工作太忙了，没时间. However, the latter means to be very positive or confident about the speaker’s words and behaviors. For instance, 甲：你肯定是他？乙：错不了，我跟他一起住过四年呢.

Foreign students may misunderstand the meaning of the structure …到家了 as somebody are in home. As a matter of fact, it is used to indicate that something reaches the extreme. For better understanding and application, the learners should also know the common collocated words in this patterns are想、服务、做、考虑、笨、赔、倒霉, etc. You can say我都讲了三遍了，你怎么还是不明白？真是笨到家了.

If you intend to express to do things without plan, you can use …到哪儿算哪儿 , which is to indicate that there is no plan to do something or the plan can’t be carried out as expected. As a result, the action can only be arranged or stopped depending on the specific situation. Foreigners who learn Mandarin in China should know that the collocated words in this pattern are mostly the monosyllabic verbs. We can say今天要讲的内容很多，恐怕讲不完，只能讲到哪儿算哪儿.

Another similar expression that the learners should know when they attend to Chinese school in China is到时候再说, which is to indicate it is not taken into account temporarily and a new plan will be made when things really tale place. For example, 甲：你将来想做什么工作呀？乙：现在我刚上大学，离毕业还早呢，到时候再说吧.