У сказуемых указать время There was a desk in my school classroom .
I will visit St Paul's Cathedral in London .
My future profession is a doctor.
Yes, it's an important profession. Because I will treat people.
The dinner was beingh done by me at 5 yesterday.
My mother will be at cinema at 5 tomorrow

There was a desk in my school classroom - Past Simple Active

I will visit St Paul's Cathedral in London - Future Simple Active

My future profession is a doctor.  - Present Simple Active

Yes, it's an important profession.  - Present Simple Active

Because I will treat people.  - Future Simple Active

The dinner was being done by me at 5 yesterday.  - Past Progressive Passive

My mother will be at cinema at 5 tomorrow - Future Simple Active