Most hard to answer questions would be about the uncountable nouns . A good one I know of is :
He said a joke to them (find the mistake and correct it ) the answer would be : He told them a joke
that's because it's tell a joke not say a joke
Hmm, that one would be good too :
He is used to (eat-eating-eats- have eaten) meat for lunch
That one would be eating because it is "is used to" not used to
You can also dig a little for some tricky questions about using until and If third conditional
you can also find good question about the if third condition
altrnates as had and such or no sooner questions
good luck!
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