zdanie gramatyka

witam

natknąłem się na takie zdanie:
I ... stay at home, but I ... myself.

gdzie właściwym uzupełnienem jest to pogrubione, wybrane z tych poniżej

must ... didn't restrain
was supposed to stay ... hadn't restrained
was to ... couldn't restrain
had been to ... wasn't able to restrain

chciłem zapytać czy ktoś mógłby napisać coś o tej pierwszej części "I was to stay at home"
czy to was to jest po prostu czasownikiem frazowym i trzeba mieć trochę wyczucia żeby go tu użyć

A czy w tym zdaniu wstawienie pierwszej możliwości odpowiedzi byłoby poprawne ?

When I ... as a teacher, I ... a lot of work to do.

was working ... had
worked ... had
worked ... used to have

A który wybór tutaj jest poprawny, ja postawiłbym na trojke
I ... football very well when I was a child. My grandpa ... also a good player.

was playing ... was
used to play ... was
used to play ... had been

to juz ostatnie :)

When I ... as a teacher, I ... a lot of work to do.

was working ... had
worked ... had
worked ... used to have

czy tutaj można by napisać tak:

When I was working as a teacher, I had a lot of work to do.

I was to stay at home - miałem zostać w domu

prędzej tak:
teacher - worked, had
football - used to play, was