I (am writing) an English exercise now. I (was writing) an English exercise at this time yesterday.
My little sister (is sleeping) now. My little sister (was sleeping) at this time yesterday.
My friends (are not doing) their homework now. They (are playing) volleyball.
My friends (were not doing) their homework at seven o’clock yesterday. They (were playing) volleyball.
What __are___you ( doing) now? — I (am drinking) tea. ___Were___you ( drinking) tea at this time yesterday? — No, I (was not drinking) tea at this time yesterday, I (was eating) a banana.
am writing
was writing
is sleeping
was sleeping
are not doing
are playing
was not doing
was playing
are you doing
am drinking
was you drinking
was not drinking
was eating