where we use could and should

hi balu Would (past form of will) Often used in auxiliary functions with rather to express preference: I would rather go shopping today. We'd rather say something than stay quiet. Used to express a wish or desire: I would like to have one more pencil. Used to express contingency or possibility: If I were you, I would be so happy. Used to express routine or habitual things: Normally, we would work until 6 p.m

hi balu Should (past form of shall) Often used in auxiliary functions to express an opinion, suggestion, preference, or idea: You should rest at home today. I should take a bus this time. He should be more thoughtful in the decision-making process. Used to express that you wish something had happened but it didn't or couldn't (should + have + past participle) : You should have seen it. It was really beautiful. I should have completed it earlier to meet the deadline. We should have visited the place on the way. Used to ask for someone's opinion: What should we do now? Should we continue our meeting? Should we go this way? Where should we go this summer? Used to say something expected or correct: There should be an old city hall building here. Everybody should arrive by 6 p.m. We should be there this evening.