1. I / go swimming / yesterday.
=> I went swimming yesterday.
2, Lan / I / study / hard / last weekend.
=> Lan and I studied hard last weekend.
3, Mrs.Nhung / wash / the dishes.
=> Mrs.Nhung washed the dishes.
4. We / not go/ school last week.
=> We didn't go to school last week.
5.They / have / nice / summer.
=> They had a nice summer.