Here are some concepts: alter, dart, pattern

What is a sentence about these concepts?

Sentence is below.
alter to a pattern without darts

Here are some concepts: event, politician, stay

What is a sentence about these concepts?

Sentence is below.
politicians stay up to date as events unfold .

Here are some concepts: bring, city, standstill

What is a sentence about these concepts?

Sentence is below.
the protest brought traffic in the city to a standstill but remained peaceful

Here are some concepts: pour, steam, train

What is a sentence about these concepts?
Sentence is below.
Two green trains with numbers on them pouring out steam.