Помогите раскрыть скобки 1.Thoes children (to help) their mother.2

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.