It was so late there was no taxi.
Your coat is broken.
Let me help you to do your work.
Susan didn't make a fault anyway.
He becomes better.
I recommend you to take a long vacation.
It was still bright outside.
Wait here, please, I'll come back in a minute.
I am uncomfortable.
Some of these mistakes are more subtle than the usual mistakes that English-learners make (even when native speakers write!), but it's a good activity to do in a class, if you're only teaching Chinese people.