1 This essay was written by Sandra three days ago.
2 I wish I could answer this question.
1) was written by Sandra three days ago.
2) I could answer this question.
1. Sandra wrote this essay three days ago.
This essay was written by Sandra three days ago.
2. What a pity I can't answer the teacher's question.
I wish I could answer this question.
Chúc bạn học tốt !!! ^-^