I've discovered this amazing thing. -
I haven't done this work. -
I've never seen snow. -
I have taught you. -
It has been a hard task. -
Have you seen the roof? -
You've stolen them. -
He hasn't finished the report yet. -
You haven't eaten a bite. -
Have they released you? -
We've learned some shocking news. -
I've never seen the desert. -
He hasn't been home for two days. -
I've never built a robot. -
We have fired too many. -
He hasn't known me long. -
You've lost me. -
We haven't met yet. -
Have you ever been to Australia? -
She's made an effort. -