" can stand as a sentence. You have been studying English. What’s it like?
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Notice that "What's it like?" can stand as a sentence.
You have been studying English. What’s it like?
The pronoun "what" is the object of the preposition "like". Here is a typical answer.
It is like opening a world of possibilities.
In your sentence, "learning English as a second language" is an
pen grape 927is the phrase "learning English as a second language" a noun pharse
Perhaps it is a sort of 'noun pharse'