EFAP present: simple, perfect, continuous, perfect continuous

This system ______ used for several years, but we

believe it is still valid today.

• is not

• has not been

I am an assistant professor at the Department of Robotics where I ______ for the last two years.

• am working

• have been working

We ______ that this is the first time that the problem has been addressed.

• believe

• are believing

At the moment I ______ on a new project.

• am working

• have been working

This is the first time we ______ a problem

like this.

• experience

• have experienced

Don’t worry! I ______ in the office since 8.0.

• am

• have been

Fortunately we ______ this problem for a while now.

• don’t have

• haven’t had

How long ______ here for – since last year or the year before?

• are you

• have you been

How long ______ here for – till the end of this year or next?

• are you

• have you been

This is the second time today that the computer ______.

• crashes

• has crashed