Present perfect/present perfect continuous

have been studying

has been studying

has studied

have studied

have been prepearing

has been prepearing

has prepeared

have prepeared

had caught a cold

has caught a cold

have caught a cold

have been caughting a cold

have already waked up

have already woke up

has already woke up

already have woke up

have ever been visiting

have ever visited

has ever visited

you have been waiting

have you been waiting

have you waited

you have waited

have been writing

has been writing

have written

has written

for

since

from

recently

for

since

from

just

have gone

have been going

went

have never been, have wanted

have never been, wanted

never was, wanted

changed

has changed

has been changing

have changed

have been changing