$\text{Snowflakes }$

`1. (+)` He has lived here for three years.

`(-)` He hasn't lived here for three years.

`(?)` Has he lived here for three years?

`2. (+)` We have been here for two weeks.

`(-)` We haven't been here for two weeks.

`(?)` Have we been here for two weeks?

`3.` `(+)` They have missed the train.

`(-)` They haven’t missed the train.

`(?)` Have they missed the train ?

`4. (+)` I have had breakfast this morning.

`(-)` I haven’t had breakfast this morning.

`(?)` Have I had breakfast this morning?

`5.` `(+)` She has passed the exam.

`(-)` She hasn't passed the exam.

`(?)` Has she passed the exam?

`6.` `(+)` You have met his mother.

`(-)` You haven’t met his mother.

(?) Have you met his mother?

`7.(+)` We have eaten too much chocolate.

`(-)` We haven’t eaten too much chocolate.

`(?)` Have we eaten too much chocolate?

`8.` `(+)` I have known David for ten years.

`(-)` I haven't known David for ten years.

`(?)` Have I known David for ten years?

`9.` `(+)` She has read that book.

`(-)` She hasn’t read that book.

`(?)` Has she read the book?