He was doing his homework all evening yesterday.
Если после used стоит инфинитив (to do/to eat), то перед used нельзя писать to be.
А если после used видим to+глагол с окончанием -ing, то перед used нужен глагол to be.
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We listen to different pieces of music and sometimes sing. The name of the subject is Music.
We spell Russian words, write dictations, do exercises The name of the subject is Russian.