Question

1)You should ( practice) singing every day.
2) She's looking forward to ( show) them her new photos.
3) Before (go) there ring me up.
4)I can't help ( smile) when I see him.
5) We enjoy (swim) on a hot day.
ing form, to+inf, bare inf( without to )

Answer 1

)You should  practic) singing every day.
2) She's looking forward to  showing them her new photos.
3) Before going there ring me up.
4)I can't help  smiling when I see him.
5) We enjoy swimming on a hot day.