He sent a message to the ship using a signal flag.

We combined our efforts to create a collaborative doujin.

My umbrella was completely useless in the sudden guerrilla rainstorm.

No problem, I will do that job.

That proposal is completely unthinkable.

As a practical question, how are we going to fund this project?

This exam is a matter of life or death for me.

He is viewing that situation as a serious problem.

He views that situation as a problem.

A new approach is needed to solve this set of problems.