1.my sister has become a doctor in boston
has my sister become a doctor in boston?
where has my sister become a doctor?
my sister has become in a doctor in boston, hasn't she?
has my sister become a doctor or a detective in boston?
my sister hasn't become a doctor in boston.
Alice tought me swimming last sammer.
Did Alice teach me swimming last sammer?
When did Alice teach me swimming?
Alice tought me swimming last sammer, doesn't she?
Did Alice teach me swimming last sammer or least spring?
Alice doesn't tought me swimming last sammer.
2. The more we learn, the more we know