Viết lại các câu sau cho hoàn chỉnh

we started living here fifteen years ago
=>we have......
when did you begin to learn English?
=>how long...
i last wrote a letter to my aunt in May.
=> i haven't
Mr Minh began to collect stamps in 2000.
=>minh has...
nga started learning French last year
=> Nga...
the last time i saw her was in 2000
=>i haven't