The summer school has also taken place here since 1991.

Over 10 000 schools from 150 countries have taken part since the beginning.

The major growth of the town has taken place since 1947.

And high school students have been required to take a year of foreign language since the early 1980's.

A significant amount of research in the area has taken place since the 1980s.

The event has been taking place every year since 2008.

An army had not directly taken the city since 1552.

Many changes have taken place in the cities since 1980.

I have been taking care of you since the accident.

I hope you will not take this in a negative way, since we?