Let's go surfing, (a)   ?

I like eating chocolate pastries, (a)   ?

The children are playing in the garden, (a)   ?

Amy likes solving maths problems, (a)   ?

I'm going to get an email with the details, (a)   ?

He's a daughter, (a)   ?

One should do one's duty, (a)   ?

If you invited me, I'd join your party, (a)   ?

The sooner, the better, (a)   ?

You and he went there, (a)   ?

You and I came to terms, (a)   ?