Here are some concepts: mask, torch, weld

What is a sentence about these concepts?

Sentence is below.
A man ignites a torch and lowers his mask, and then starts to weld something.

Here are some concepts: head, station, train

What is a sentence about these concepts?

Sentence is below.
a high speed train heading at central station

Here are some concepts: death, fall, watch

What is a sentence about these concepts?

Sentence is below.
The man is watching the other man fall to his death.

Here are some concepts: afternoon, boat, marina

What is a sentence about these concepts?
Sentence is below.
boats are moored in the marina on thursday afternoon .