Ответ:

2)He is lost his keys

3)She has bought a new dress

4)They are selling their house

Ответ:

2. He’s lost his keys / he had lost his keys

3. She’s bought a new dress / she had bought a new dress

Надеюсь что помогла!

Говорю на английском больше 10 лет, все правильно ^^