Ing or To Inf? (Upper Int)

I stopped to have a coffee....

• because I couldn't sleep if I drank it at night

• because I didn't want to fall asleep at the wheel

I stopped having coffee

• because I couldn't sleep if I drank too much

• because I didn't want to fall asleep during class

I regret to say...

• that your application for secondment to Brussels hasn't been successful

• I'd apply for the post in Brussels

I regret saying

• that the wedding has been canceled.

• that was all the budget that I needed. I should have asked for more.

I don't remember signing the cheque...

• but I must have done it, because the bill was paid.

• and that's why the bank sent it back to me

I didn't remember to call her....

• and that's why she is so upset at me.

• but my wife must have, because she thanked us for greeting her for her birthday.

I'll never forget sending you a birthday card...

• because it was on my computer's calendar.

• you looked so happy when you got it!

I'll never forget to send you a birthday card....

• because I was stuck in the post office for hours.

• because my mother always reminds me to do so!