Where do you use phrasal verb?

English phrasal verbs are very common in speech. In writing especially formal writing they are substituted by single Word verbs. For example:

put out = extinguish. pick up = collect. put off = postppone

Apart from this phrasal verbs are used everywhere. Some examples:

I picked up Spanish when I lived in Madrid.

The picnic has been put off until next week.

The boys look up to the new teacher.

The fire men put out the fire after a long struggle.

They have broken off their engagement.

She took the book back to the library.