my mother went to bed after I got back home last night.(同意句)my mother()go to bed ()Igot back home last night.

问题描述:

my mother went to bed after I got back home last night.(同意句)
my mother()go to bed ()Igot back home last night.

My mother didn't go to bed until I got back home last night.

my mother(didn't)go to bed (until)Igot back home last night.

didn't,until
not...until直到...才