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What is the difference between a surface structure and a deep structure?

As per Chomsky deep structure refers to concepts, thoughts, ideas & feelings whereas surface structure refers to the words / language we use to represent the deep structure. Deep structure is what you wish to express and surface structure how you express it in with the help of words and sentence.

What is the all and only criterion?

The “all and only” criterion means that our analysis must account for all the grammatical correct phrases and sentences and only those grammatical correct phrases and sentences in whatever language we are analyzing.

Does movement happen at surface or deep structure?

In syntax, we assume that every question starts out the same way that a sentence does in the Deep Structure (except for a feature on C), but that movement occurs when it transitions to Surface Structure.

What is the all and only criterion of generative grammar?

This is the “all and only” criterion rule – grammar must generate all the grammatical sentences and only the grammatical sentences.