1.A:Who is knocking at the door?
B:It's me.(是我)
2.A:Who teaches me/us physics?(谁教我/我们物理)
B:We teach you.(我们教你/你们)
3.A:Hello.I'd like to speak to Mary,please.
B:Speaking.Who's calling,please?
A:Hi,Mary.This is Tom.(打电话回答人名时用this is…)
1.A:Who is knocking at the door?
B:It's me.(是我)
2.A:Who teaches me/us physics?(谁教我/我们物理)
B:We teach you.(我们教你/你们)
3.A:Hello.I'd like to speak to Mary,please.
B:Speaking.Who's calling,please?
A:Hi,Mary.This is Tom.(打电话回答人名时用this is…)