1 to keep ( try + To v: cố gắng)
2 to lock ( told sb to do sth)
3 to use ( allow +O + to V)
4 to know ( want + to V)
5 watching ( enjoy+ Ving)
6 to go ( decide + to V)
7 waiting ( mind + Ving)
8 having ( suggest + Ving)
9 wasting ( regret + Ving: đã làm rồi)