Direction: underline the opinion marking signal used?

1.i believe the copying is easier than answering.
2. in my opinion the people are quite hesitant to complained because the accused widely.
3.you may be right but we should first listen to the other party.
4. many people say that police officer can't be trusted.
5.personally I think the barangay officials must implement stricter ordinance to avoid selling alcoholic drink during pandemic.​