1 . hoa/ have/ math/ three times/ a week .
-> Hoa has math three times a week.
2. we /receive/ report /ago.
-> We received the report long time ago.
3 . his mother/ very sad /he/ study /badly every semester.
-> His mother is very sad because he studies badly every semester.
4.we/ going /clean /lakes ' banks/ weekend
-> We are going to clean the lakes' banks at weekend.