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 )

)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.