Answer:

• Opinion-marking signals are words or phrases used to show feelings, emotions and attitude towards something
• "prefer," "think," "feel," "should," and "best."
• Opinion-marking signals are words or phrases used to show feelings, emotions and attitude towards something. They are helpful clues in the forms of words and phrases that assist us in identifying opinion statement. They are found mostly at the beginning of the sentences. They introduce one's opinion
• We need to express our opinions and, at the same time, show that we are listening, understanding and appreciating the other opinions. ... Tip: It is always a good idea to justify your opinions. Don't just say 'I agree' or 'I disagree', but say 'I agree because I think that ... (explain your reason)', etc.