Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in two parts of the sentence. Mark the parts with the error as your answer. If there is no error, mark (5). (Ignore errors of punctuation, if any)                                                     Trade negotiations are (1)/ never easy and for them (2)/ to success, both sides have to (3)/ believe in a policy of give and take (4)