It's very difficult to wind surf properly

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2.It's very difficult to wind surf properly.
10 It's more difficult to speak a foreign language than to read it.
11,It is forbidden to walk on the grass.
12.One thing I can't do is swim on my back
13.It's difficult to be polite to someone you don't like.
14 It's not easy to change money here on a Saturday
15.It is impossible to park your car during office hours.