can anyone provide me a short critique for the following analyses of the sentence. About their advantages and disadvantages and provide evidence if possible!!thank you.
I have no idea about this.
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You need to learn how to use diagnostics to tell you whether you have the right structure. One such diagnostic is provided by "and", which connects constituents of the same category. In the tree you give, "might have been watching television" is not a constituent. Yet we can form:
He [[might have been watching television] and [has no idea what happened]].
That tells us that "might have been watching television" is actually a constituent which has the same category as "has no idea what happened".