I / not / know / him for three months
I haven't known him for three months.
She / not / see / The Lord of the Rings
She hasn't see The Lord of the Ring.
John / not / buy / any food
John hasn't bought any food.
She / not / leave / her phone in a taxi
She hasn't left her phone in a taxi.
They / write / to the politician
They have written to the politician.
She / not / clean / the kitchen
She hasn't cleaned the kitchen
We / try / roller-skating
We have tried roller- skating.
They / not / be / in London for six months
They haven't been in London for six months.
We / not / find / the book yet
We haven't found the book yet.
We / not / go / to Paris
We haven't gone to Paris.
They / not / visit / St. Paul's
They hasn't visited St. Paul's
Lucy / cook / breakfast
Lucy has cooked breakfast.
You / not / study / French for ten years
You haven't studied French for ten years.
He / not / meet / my mother
He hasn't met my mother.