But I still don't see how he managed to prove his alibi, and yet go to the chemist's shop? Poirot stared at me in surprise. 
It's hard to see how he managed to prove his story is true.
He failed dismally to prove his alibi.
A man is fishing.
puppies are kissing
Two dogs are eating their food.
The person is at his breaking point.
The train's roof was shaky.
A player hitting a home run.