Помогите раскрыть скобки
1.Thoes children (to help) their mother.
2. Denis (to work) at a new project this semester.
3. We (to know) each other since 1990.
4. The inspector (to keep) a watch on the house for last few days.
5. I ( to see) the sea long ago, in my childhood.
6 The builders ( to finish) the work by the end of the day.