Ответ:

1-have you seen/has been trying

2-have know/Has she been studying

3-has been loosing/hasn't eaten

4-have you been cleaning/have just started

Ответ:

1.Have you seen/has been trying

2.have known /Has she been studying

3.has lost/hasn't been eating

4.Have you been cleaning /have just been starting.

Объяснение:

неуверенна но вроде так