предложения на английский язык.

Ответы:

1. Where is the key? I dont know. Ive (have) lost it. 

2. I have been learning English for all my life

3. Ive visited all of London sights yet. 

4. When Id (had) come to Paris, she had left to Moscow yet. 

насчет 4ого предложения сомневаюсь. либо Past Perfect, либо Present Perfect