Нужно поставить в инфинитив или в v-ing. 1. frank has decided (join) an environmental organization. 2. judy didn't let her children (go) underwater diving. 3. there's an interesting documentary on tv. fancy (watch) it?

1. Frank has decided to join an environmental organization.
2. Judy didn't let her children to go underwater diving.
3. There's an interesting documentary on TV. Fancy watching it?