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You are watching your friend attempt to carry a ridiculously tall, wobbly stack of pancakes across the kitchen. Select ALL the dramatic predictions that are grammatically correct.
The correct answers are Watch out, that tower is going to fall! and Oh no, those pancakes are going to slide right off the plate!
We use "going to" to make predictions when there is clear physical evidence right now (like a wobbly stack of pancakes!).
"The top pancake" is singular, so it needs "is", not "are". "He is going to dropping" is incorrect because "going to" must be followed by the base form of the verb ("drop").