Please imagine someone draws their shoulders towards each other and lowers their chin towards their chest. What they are doing? For more clarification please have a look on my added pics and let me know what a mother should say to her children when they "sit" or "stand" like these:
Bringing up this question I needed to enquire whether these verbs mean the same and are interchangeable or not. If not, then how do they differ in meaning, connotation and usage?
Also, I wonder what are the standard forms of these two sentences?