Put the werbs into Present Continious, Present Perfect or Present Perfect Continious. My friend (not to be) to London yet.
Look! The Queen`s guard (to change)
I (ti watch) the street perfomance for an hour
This man ___ (to wander) around the sity since early morning
My friend hasn't been to London yet.
Look! The Queen`s guard is changing.
I have watched the street perfomance for an hour
This man has wandering around the sity since early morning