mMeeting

Hello Sally,
Why don’t we meet on Tuesday at 6 p.m.?
I must    going  to go to the doctor in the morning. so So it is impossible to me meet you in the morning.
We met in the shopping centre. Don’t forget it.

Regards,
JuanFran.

meeting ("Meeting")

Hello Sally,
Why don’t we meet on Tuesday at 6 p.m.? (there is no ".?" in English, the ? already has the . in it)
I must to go ("I must go") to the doctor in the morning so it is impossible to ("for") me ("to") meet in the morning.
We ("should meet", "can meet".. met is past tense "we met yesterday") met in the shopping centre. Don’t forget it.

Regards,
JuanFran.