She covered her eyes instead of her nose and mouth. She should have covered her nose and mouth.
She’s been having high fever and a cough for 7 days. She didn’t go to the hospital. It turned out she had corona virus. She should have gone to the hospital earlier.
The government didn’t take decisive action. They should have taken decisive action.
We didn’t separate our trash. We should have separated our trash
We left plastic straws on the beach. We shouldn’t have left plastic straw on the beach.
(I did it.) 1 2 3 4
1 2 3 (I said that.)
To you, Last year I laughed at you and looked down on you. I shouldn’t have done that. I’m sorry.
To you, I didn’t help you finish the group project. I should have helped. I’m sorry.
To you, Behind your back, I said bad things about you. I shouldn’t have said that. I’m sorry.